Anatomy of the Large Intestine

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Questions and Answers

What is the primary function of the digestive system?

  • To absorb nutrients from the food
  • To break down food and utilize its energy (correct)
  • To eliminate indigestible substances from the body
  • To store food in the body

Which part of the digestive tract is responsible for the mechanical digestion of food through chewing?

  • Large intestine
  • Oral cavity (correct)
  • Small intestine
  • Stomach

What is the term for the movement of food through the digestive tract by alternate contraction and relaxation?

  • Peristalsis (correct)
  • Propulsion
  • Segmentation
  • Churning

What is the primary function of bile salts in the digestive process?

<p>Emulsify fats (C)</p> Signup and view all the answers

What is the main difference between the liver and the gallbladder in terms of bile storage?

<p>The liver produces bile, while the gallbladder stores it (A)</p> Signup and view all the answers

Which layer of the digestive tract contains blood vessels?

<p>Submucosa (D)</p> Signup and view all the answers

What is the term for the lining of the peritoneal cavity?

<p>Visceral peritoneum (B)</p> Signup and view all the answers

Which of the following is NOT a function of the liver?

<p>Regulation of blood pressure (D)</p> Signup and view all the answers

Which part of the digestive tract is responsible for the absorption of nutrients?

<p>Small intestine (D)</p> Signup and view all the answers

What is the primary function of the pancreatic enzyme trypsin?

<p>Digestion of proteins (D)</p> Signup and view all the answers

What is the term for the process by which Kupffer cells engulf and digest worn-out or dying cells?

<p>Phagocytosis (C)</p> Signup and view all the answers

What is the term for the elimination of indigestible substances from the body?

<p>Defecation (D)</p> Signup and view all the answers

What is the main reason for the formation of gallstones?

<p>Drastic dieting (C)</p> Signup and view all the answers

Which layer of the digestive tract is responsible for contraction and relaxation?

<p>Muscularis (A)</p> Signup and view all the answers

What is the term for the tube that connects the gallbladder to the common bile duct?

<p>Cystic duct (D)</p> Signup and view all the answers

What is the primary function of sodium bicarbonate in the pancreatic secretions?

<p>Neutralization of acidic chyme (C)</p> Signup and view all the answers

What is the primary function of the omental appendices?

<p>To store fat for energy (A)</p> Signup and view all the answers

What is the main difference between loose stool and diarrhea?

<p>Diarrhea is a result of insufficient water absorption, while loose stool is a result of insufficient water absorption and an underlying infection (C)</p> Signup and view all the answers

What is the name of the smooth muscle that controls the anal sphincter?

<p>Internal anal sphincter (A)</p> Signup and view all the answers

What is the name of the structure that forms the last 15 cm of the digestive tract?

<p>Rectum (A)</p> Signup and view all the answers

What is the function of the hausta?

<p>To permit the colon to expand and elongate (D)</p> Signup and view all the answers

What is the term for the longitudinal bands of muscularis externa along the outer surface of the colon?

<p>Teniae coli (A)</p> Signup and view all the answers

What is the result of too much water being absorbed by the large intestine?

<p>Constipation (B)</p> Signup and view all the answers

What is the term for the exit of the anal canal?

<p>Anal orifice (A)</p> Signup and view all the answers

What is the primary function of HCI produced by Parietal Cells in the stomach?

<p>Kills bacteria and stops C6H12O6 digestion by inactivating salivary amylase (B)</p> Signup and view all the answers

What is the consequence of the failure of Vitamin B12 absorption?

<p>Pernicious Anemia (B)</p> Signup and view all the answers

Which type of cells in the stomach produces pepsinogen that aids in the breakdown of proteins?

<p>Chief Cells (B)</p> Signup and view all the answers

What is the main function of the Small Intestine in the digestive system?

<p>Segmentation and mixing of chyme with digestive juices (D)</p> Signup and view all the answers

What percentage of nutrients and water are absorbed in the Small Intestine?

<p>90% (C)</p> Signup and view all the answers

What is the term for the reverse movement of food brought about by a signal from the medulla?

<p>Reverse Peristalsis (C)</p> Signup and view all the answers

What is the term for the wound inside the stomach caused by H.pylori bacteria?

<p>Gastric Ulcers (C)</p> Signup and view all the answers

What is the length of the Small Intestine?

<p>6 meters (A)</p> Signup and view all the answers

What is the function of villi and microvilli in the intestine?

<p>To increase the surface area for absorption (A)</p> Signup and view all the answers

What is the function of the Ileocecal valve?

<p>To prevent backflow of feces into the small intestine (D)</p> Signup and view all the answers

What is the primary function of the Large Intestine?

<p>To absorb water, ions, and vitamins (A)</p> Signup and view all the answers

What is the function of Payers Patches in the Large Intestine?

<p>To produce immune cells (C)</p> Signup and view all the answers

What is the movement of fecal material in the Large Intestine?

<p>Sluggish (B)</p> Signup and view all the answers

What is the term for the formation of feces in the Large Intestine?

<p>Defecation (D)</p> Signup and view all the answers

What is the function of the appendix in the Large Intestine?

<p>To aid in immunity (C)</p> Signup and view all the answers

What does unusual stool indicate about the Large Intestine?

<p>That there is something wrong with it (C)</p> Signup and view all the answers

What is the primary function of the gonads in the male reproductive system?

<p>Production of gametes and androgens (B)</p> Signup and view all the answers

What is the purpose of the epididymis in the male reproductive tract?

<p>To store and mature sperm (D)</p> Signup and view all the answers

What is the function of the seminal vesicles in the male reproductive system?

<p>To secrete mucous to aid in sperm transport (C)</p> Signup and view all the answers

What is the endocrine function of the gonads?

<p>Production of testosterone and gametogenesis (D)</p> Signup and view all the answers

What is the purpose of the scrotum in the male reproductive system?

<p>To regulate the temperature of the testes (B)</p> Signup and view all the answers

What is the purpose of the vas deferens in the male reproductive tract?

<p>To transport sperm from the epididymis to the ejaculatory duct (A)</p> Signup and view all the answers

What is the function of the bulbourethral glands in the male reproductive system?

<p>To secrete mucous to aid in sperm transport (B)</p> Signup and view all the answers

What is the purpose of the tunica albuginea in the male reproductive anatomy?

<p>To enclose and protect the testes (C)</p> Signup and view all the answers

What is the function of the tight junctions between Sertoli cells?

<p>To form a blood-testis barrier and control the availability of nutrients to the germ cells (D)</p> Signup and view all the answers

What is the function of Sertoli cells?

<p>To guide sperm cells towards the lumen (A)</p> Signup and view all the answers

What is the velocity of movement of sperm cells?

<p>1-4 mm/min (A)</p> Signup and view all the answers

What is the function of adherens and gap junctions between Sertoli cells and sperm cells?

<p>To provide a specialized, immunologically safe microenvironment for developing sperm (B)</p> Signup and view all the answers

What is the number of microtubules in the axoneme of a sperm cell's flagellum?

<p>11 (B)</p> Signup and view all the answers

What is the function of the blood-testis barrier?

<p>To control the availability of nutrients to the germ cells (D)</p> Signup and view all the answers

What is the origin of spermatozoa?

<p>Spermatogonia (D)</p> Signup and view all the answers

What is the process by which sperm cells develop from spermatogonia?

<p>Spermatogenesis (C)</p> Signup and view all the answers

What is the primary function of Sertoli cells in the testis?

<p>To produce androgen-binding protein (ABP) to maintain high androgen levels (C)</p> Signup and view all the answers

Which cells in the male reproductive tract are responsible for converting testosterone to estradiol?

<p>Aromatase-expressing cells (B)</p> Signup and view all the answers

What is the primary function of the epididymis in the male reproductive tract?

<p>To provide a medium for sperm to develop motility (B)</p> Signup and view all the answers

What is the role of Mullerian-inhibiting substance (MIS) during embryonic development?

<p>To inhibit the development of the Mullerian ducts (C)</p> Signup and view all the answers

Which cells in the male reproductive tract express LH receptors and produce testosterone?

<p>Leydig cells (B)</p> Signup and view all the answers

What is the function of inhibin in the male reproductive tract?

<p>To provide negative feedback to FSH (A)</p> Signup and view all the answers

What is the role of the peritubular compartment in the male reproductive tract?

<p>To support the structural integrity of the seminiferous tubules (B)</p> Signup and view all the answers

What is the primary function of Leydig cells in the male reproductive tract?

<p>To produce testosterone and other androgens (B)</p> Signup and view all the answers

What percentage of excreted androgens are found as urinary 17-ketosteroids?

<p>50% (D)</p> Signup and view all the answers

Where does feedback occur from in the hypothalamic-pituitary-testicular axis?

<p>Peripheral T (A)</p> Signup and view all the answers

What is the main component of seminal plasma?

<p>Seminal plasma proteins (D)</p> Signup and view all the answers

What is the volume of semen after several days of abstinence?

<p>2.5-3.5 mL (D)</p> Signup and view all the answers

What is the function of Prostate Specific Antigen?

<p>Coagulate semen (B)</p> Signup and view all the answers

What controls the spenal cord during erection?

<p>Sacral spinal cord (B)</p> Signup and view all the answers

What is the main function of the peritubular compartment in the male reproductive system?

<p>To provide nutrition to sperm cells (C)</p> Signup and view all the answers

What is the result of excess negative feedback in the hypothalamic-pituitary-testicular axis?

<p>Decreased intratesticular T (C)</p> Signup and view all the answers

Which gland is located inferior to the seminal vesicle in the male reproductive system?

<p>Prostate gland (C)</p> Signup and view all the answers

Which glands produce secretions that make up seminal plasma?

<p>Seminal vesicles, prostate, and bulbourethral glands (A)</p> Signup and view all the answers

What is the function of Sertoli cells in the male reproductive system?

<p>To support spermatogenesis (A)</p> Signup and view all the answers

What is the name of the tube that connects the epididymis to the vas deferens?

<p>Epididymal duct (C)</p> Signup and view all the answers

What is the main function of the epididymis in the male reproductive system?

<p>To store and mature sperm cells (B)</p> Signup and view all the answers

Which structure is located outside the body cavity and is part of the male reproductive system?

<p>Penis (D)</p> Signup and view all the answers

What is the function of the scrotum in the male reproductive system?

<p>To support and protect the testes (A)</p> Signup and view all the answers

How do sperm cells travel from the testes to the epididymis?

<p>Through the epididymal duct (B)</p> Signup and view all the answers

What is the primary function of the epididymis in the male reproductive system?

<p>To facilitate sperm maturation and improve motility (D)</p> Signup and view all the answers

What is the role of the vas deferens in the male reproductive system?

<p>To propel sperm into the prostatic urethra during ejaculation (D)</p> Signup and view all the answers

What is the function of the seminal vesicles in the male reproductive system?

<p>To secrete fructose and other nutrients for sperm (D)</p> Signup and view all the answers

What is the primary function of the bulbourethral glands in the male reproductive system?

<p>To secrete mucus that helps to lubricate the urethra during ejaculation (A)</p> Signup and view all the answers

What is the significance of luminal testosterone-androgen binding protein complexes in the epididymis?

<p>They facilitate sperm maturation (B)</p> Signup and view all the answers

What is the characteristic of the epithelial lining of the epididymis?

<p>Pseudostratified columnar epithelium (A)</p> Signup and view all the answers

What is the structure that surrounds the testicular vessel in the male reproductive system?

<p>Cremaster muscle (D)</p> Signup and view all the answers

What is the primary function of the Peritubular Compartment in the male reproductive tract?

<p>to provide structural support to the seminiferous tubules (A)</p> Signup and view all the answers

What is the role of Mullerian-inhibiting substance (MIS) during embryonic development?

<p>to inhibit the development of female reproductive organs (D)</p> Signup and view all the answers

What is the function of Leydig cells in the male reproductive tract?

<p>to produce testosterone through steroidogenic enzymes (B)</p> Signup and view all the answers

What is the outcome of failure of negative feedback to FSH?

<p>unregulated spermatogenesis (A)</p> Signup and view all the answers

What is the function of Sertoli cells in the male reproductive tract?

<p>to facilitate spermatogenesis through tight junctions (A)</p> Signup and view all the answers

What is the primary function of the epididymis in the male reproductive tract?

<p>to facilitate the maturation of sperm cells (C)</p> Signup and view all the answers

What is the role of inhibin in the male reproductive tract?

<p>to inhibit the production of FSH (B)</p> Signup and view all the answers

What is the purpose of the corpus spongiosum in the male reproductive organ?

<p>To provide structural support to the glans penis (B)</p> Signup and view all the answers

What is the primary function of the prostate gland in the male reproductive system?

<p>To produce alkaline secretions that make up 20-30% of semen volume (A)</p> Signup and view all the answers

What is the role of the bulbourethral glands in the male reproductive system?

<p>To secrete lubricating mucus during sexual arousal (B)</p> Signup and view all the answers

What is the term for the distal end of the male reproductive organ?

<p>Glans penis (C)</p> Signup and view all the answers

What is the function of the fibrous connective tissue capsule that surrounds the prostate gland?

<p>To provide structural support to the prostate gland (A)</p> Signup and view all the answers

What is the term for the removal of the foreskin through a surgical procedure?

<p>Circumcision (D)</p> Signup and view all the answers

What is the term for the expansion on the side of the glans penis?

<p>Glans expansion (D)</p> Signup and view all the answers

What is the primary mechanism by which arteriolar dilation leads to engorgement of cavernous tissue?

<p>Cavernous engorgement presses on veins in the penis, thus reducing venous drainage (B)</p> Signup and view all the answers

Under which type of nervous control is the release of NO and VIP observed?

<p>Parasympathetic control (B)</p> Signup and view all the answers

What is the primary function of the secretion from the bulbourethral glands?

<p>Aiding in lubrication during sexual intercourse (C)</p> Signup and view all the answers

Which neurotransmitter is responsible for the relaxation of cavernous smooth muscle?

<p>Vasoactive intestinal peptide (C)</p> Signup and view all the answers

What is the primary source of lubrication during sexual intercourse?

<p>Female reproductive organs (B)</p> Signup and view all the answers

What is the consequence of inadequate lubrication during sexual intercourse?

<p>Pain and inhibited sexual sensations (B)</p> Signup and view all the answers

Which type of muscle is responsible for the contraction and relaxation of the cavernous tissue?

<p>Smooth muscle (D)</p> Signup and view all the answers

What is the primary function of the urethral glands?

<p>Secretion of mucus or 'pre-cum' (D)</p> Signup and view all the answers

Under which type of nervous control is the release of NO and VIP inhibited?

<p>Sympathetic control (D)</p> Signup and view all the answers

What is the primary function of the cavernous tissue?

<p>Facilitating erection (C)</p> Signup and view all the answers

What is the primary function of the adherens and gap junctions between Sertoli cells and developing sperm cells?

<p>To provide structural support (B)</p> Signup and view all the answers

What is the velocity of movement of sperm cells in mm/min?

<p>1-4 (D)</p> Signup and view all the answers

What is the function of the blood-testis barrier formed by tight junctions between Sertoli cells?

<p>To restrict the movement of substances between the blood and sperm cells (C)</p> Signup and view all the answers

How many microtubules make up the axoneme of a sperm cell's flagellum?

<p>11 (A)</p> Signup and view all the answers

What is the function of Sertoli cells in the male reproductive system?

<p>To nurture developing sperm cells (A)</p> Signup and view all the answers

What is the result of the formation of the blood-testis barrier by tight junctions between Sertoli cells?

<p>Decreased permeability of the blood-testis barrier (D)</p> Signup and view all the answers

What is the primary function of the gonads in the male reproductive system?

<p>Production of reproductive hormones (C)</p> Signup and view all the answers

What is the function of the tunica albuginea in the male reproductive anatomy?

<p>Enclosure of the testes (A)</p> Signup and view all the answers

What is the temperature required for gametogenesis in the testes?

<p>3-5 degrees lower than body temperature (C)</p> Signup and view all the answers

What is the function of the bulbourethral glands in the male reproductive system?

<p>Secretion of mucous to aid sperm (B)</p> Signup and view all the answers

What is the primary function of the reproductive tract in the male reproductive system?

<p>Carrying of sperm from the testes to the urethra (D)</p> Signup and view all the answers

What is the role of testosterone in the male reproductive system?

<p>Development of primary and secondary sexual characteristics (D)</p> Signup and view all the answers

What is the main function of the prostate gland in the male reproductive system?

<p>Produces alkaline fluid, accounting for 20-30% of semen volume (D)</p> Signup and view all the answers

What is the function of the corpus spongiosum in the male reproductive anatomy?

<p>Contains the urethra (D)</p> Signup and view all the answers

What is the purpose of the bulbourethral glands in the male reproductive system?

<p>Produces mucus-rich secretion for lubrication (D)</p> Signup and view all the answers

What is the function of the glans penis in the male reproductive anatomy?

<p>Is the most sensitive part of the penis (B)</p> Signup and view all the answers

What surrounds the prostate gland?

<p>A fibrous connective tissue capsule (D)</p> Signup and view all the answers

What is the term for the foreskin that covers the glans penis?

<p>Prepuce (C)</p> Signup and view all the answers

What is the primary mechanism by which arteriolar dilation leads to engorgement of the penis?

<p>Relaxation of cavernous smooth muscle (B)</p> Signup and view all the answers

What is the primary function of the bulbourethral glands in the male reproductive system?

<p>Secretion of mucus or 'pre-cum' to aid in lubrication (A)</p> Signup and view all the answers

What is the primary neurotransmitter responsible for the relaxation of cavernous smooth muscle?

<p>Nitric oxide (D)</p> Signup and view all the answers

What is the primary function of the parasympathetic nervous system in the male reproductive system?

<p>Release of NO and VIP to aid in erection (C)</p> Signup and view all the answers

What is the primary source of lubrication during the sexual act?

<p>Female reproductive organs (A)</p> Signup and view all the answers

What is the significance of the shift from parasympathetic to sympathetic control during ejaculation?

<p>It causes peristaltic contractions of the vas deferens and seminal vesicles (D)</p> Signup and view all the answers

What is the function of the internal sphincter of the bladder during ejaculation?

<p>It constricts to prevent retrograde ejaculation (C)</p> Signup and view all the answers

What is the term for the entire period of emission and ejaculation?

<p>Male nodal response (C)</p> Signup and view all the answers

What is the result of a failure of the processus vaginalis to disintegrate?

<p>Cryptorchidism (D)</p> Signup and view all the answers

What is the function of the pelvic floor muscles during ejaculation?

<p>They propel semen out of the body (A)</p> Signup and view all the answers

What is the result of ejaculation?

<p>Resolution and a return to a flaccid state (B)</p> Signup and view all the answers

At what age does the gradual decline in testosterone and sperm production start?

<p>50 (A)</p> Signup and view all the answers

What is the term for the inability to develop or maintain an erection?

<p>Erectile Dysfunction (B)</p> Signup and view all the answers

What is the characteristic of sperm with abnormal morphology?

<p>Infertility (B)</p> Signup and view all the answers

What is the term for the ejaculation that occurs prior to or within ~1 minute of vaginal penetration?

<p>Premature Ejaculation (B)</p> Signup and view all the answers

What is the result of damage to the tubular epithelium in the male reproductive system?

<p>Abnormal sperm count (B)</p> Signup and view all the answers

What is the hormone responsible for the increase in LH and FSH in Andropause?

<p>Testosterone (A)</p> Signup and view all the answers

What is the approximate total length of the seminiferous tubules in the human testes?

<p>Half a mile (A)</p> Signup and view all the answers

During which weeks of gestation does the descent of testes occur?

<p>7th to 9th month (B)</p> Signup and view all the answers

What is the percentage of the time the testis is in the scrotum by the 9th month of gestation?

<p>98% (B)</p> Signup and view all the answers

What is the function of the gubernaculum in the development of the testes?

<p>To guide the descent of testes (D)</p> Signup and view all the answers

What is the term for the process by which immature sperm cells develop into mature sperm cells?

<p>Spermatogenesis (D)</p> Signup and view all the answers

What is the stage of meiosis that produces haploid cells?

<p>Meiosis II (D)</p> Signup and view all the answers

What is the structure that forms a connection between the testes and the scrotum?

<p>Gubernaculum (C)</p> Signup and view all the answers

What is the primary function of Sertoli cells in the male reproductive tract?

<p>Producing fluid for sperm movement and phagocytosing residual bodies (C)</p> Signup and view all the answers

What is the main function of Leydig cells in the male reproductive tract?

<p>Producing testosterone from cholesterol through steroidogenic enzymes (B)</p> Signup and view all the answers

What is the purpose of Mullerian-inhibiting substance (MIS) during embryonic development?

<p>Inhibiting the development of Müllerian ducts in males (D)</p> Signup and view all the answers

What is the function of the peritubular compartment in the male reproductive tract?

<p>Providing structural support and maintaining testicular architecture (A)</p> Signup and view all the answers

What is the consequence of failure in negative feedback to FSH production?

<p>Underproduction of inhibin leading to hyperactivation of Sertoli cells (D)</p> Signup and view all the answers

What is the primary function of aromatase in the male reproductive tract?

<p>Converting testosterone to estradiol (D)</p> Signup and view all the answers

What is the purpose of inhibin in the male reproductive tract?

<p>Providing negative feedback to FSH production to regulate spermatogenesis (A)</p> Signup and view all the answers

What is the primary function of 5α-reductase Type 2 in the male body?

<p>To facilitate masculinization of the external genitalia in utero and during puberty (A)</p> Signup and view all the answers

Which of the following enzymes is involved in the conversion of cholesterol into testosterone in the Leydig cells?

<p>CYP11A1 (B)</p> Signup and view all the answers

Where does the enzyme aromatase convert testosterone into estradiol?

<p>In adipose tissue (C)</p> Signup and view all the answers

What is the primary function of dihydrotestosterone (DHT) in the male body?

<p>To stimulate the formation of prostate gland (B)</p> Signup and view all the answers

Which of the following tissues is involved in the conversion of testosterone into dihydrotestosterone (DHT)?

<p>Skin (B)</p> Signup and view all the answers

What is the function of 3β-hydroxysteroid dehydrogenase (3β-HSD) in the Leydig cells?

<p>To convert pregnenolone into progesterone (D)</p> Signup and view all the answers

What is the role of CYP17 in the conversion of cholesterol into testosterone in the Leydig cells?

<p>To convert progesterone into androstenedione (B)</p> Signup and view all the answers

What is the main function of the epididymis?

<p>To store and mature spermatozoa (D)</p> Signup and view all the answers

What type of epithelium is found in the epididymis and vas deferens?

<p>Pseudostratified columnar (C)</p> Signup and view all the answers

What is the function of the vas deferens?

<p>To propel spermatozoa into the prostatic urethra (D)</p> Signup and view all the answers

What structure contains the urethra in the male reproductive system?

<p>Corpus spongiosum (B)</p> Signup and view all the answers

What is the role of luminal testosterone-androgen binding protein complexes in the epididymis?

<p>To improve unidirectional motility of spermatozoa (D)</p> Signup and view all the answers

What is the function of the glans penis?

<p>To increase sensation during copulation (B)</p> Signup and view all the answers

What is the function of the foreskin (prepuce)?

<p>To protect the glans penis (D)</p> Signup and view all the answers

What is the primary mechanism by which the penis becomes engorged during erection?

<p>Arteriolar dilation and increased blood flow to erectile tissue (A)</p> Signup and view all the answers

Which of the following glands is responsible for producing the majority of the lubrication during sexual intercourse?

<p>Female sexual organs (B)</p> Signup and view all the answers

What is the primary function of semenogelins in semen?

<p>To initially coagulate and then liquefy semen (C)</p> Signup and view all the answers

Under which type of nervous control is erection primarily produced?

<p>Parasympathetic control (C)</p> Signup and view all the answers

What is the typical range of sperm cells per milliliter of semen after several days of abstinence?

<p>75-400 M (C)</p> Signup and view all the answers

What is the primary function of the prostate specific antigen (PSA)?

<p>To break down seminal vesicle secretions (A)</p> Signup and view all the answers

Which of the following is a common consequence of inadequate lubrication during sexual intercourse?

<p>Pain and inhibited sexual sensations (A)</p> Signup and view all the answers

What is the primary function of the cavernous smooth muscle during erection?

<p>To relax and increase blood flow to erectile tissue (D)</p> Signup and view all the answers

Which neurotransmitter is responsible for the relaxation of cavernous smooth muscle during erection?

<p>NO (Nitric Oxide) (B)</p> Signup and view all the answers

What is the typical volume of semen after several days of abstinence?

<p>2.5-3.5 mL (A)</p> Signup and view all the answers

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