Urinary System Overview and Structure
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Questions and Answers

What is the primary function of the testes?

  • Production of hormones and sperm (correct)
  • Regulation of body temperature
  • Nutrient absorption
  • Sperm storage

Which structures are primarily responsible for the production of ovum in females?

  • Ovaries (correct)
  • Vagina
  • Uterine tubes
  • Cervix

What is the role of sustentacular cells in the male reproductive system?

  • To form the ejaculatory duct
  • To provide nutrition and support to germ cells (correct)
  • To produce testosterone
  • To facilitate sperm motility

How long can stored sperm remain viable in the epididymis before degradation?

<p>40-60 days (B)</p> Signup and view all the answers

What connects the ovaries to the uterus in the female reproductive system?

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

Where does the fertilization of an ovum typically occur?

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

What is the primary structural feature of the uterus?

<p>Muscular wall to support fetal development (C)</p> Signup and view all the answers

What initiates the process of ovulation in the ovaries?

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

What type of cells produce testosterone in the testes?

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

Which part of the male reproductive tract is primarily responsible for sperm transport during ejaculation?

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

What is the main component that provides energy for sperm movement?

<p>ATP from mitochondria (C)</p> Signup and view all the answers

How many eggs are typically released in a monthly cycle during a woman's reproductive years?

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

During which phase of the ovarian cycle does ovulation typically occur?

<p>Mature follicle phase (A)</p> Signup and view all the answers

What substance helps attach sperm to the vaginal wall or cervical canal?

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

What occurs during the secretory phase of the menstrual cycle?

<p>Thickening of the endometrium (C)</p> Signup and view all the answers

When does the luteal phase typically occur in the ovarian cycle?

<p>Days 15-28 (B)</p> Signup and view all the answers

Which hormone primarily stimulates the growth of follicles during the follicular phase?

<p>Follicle Stimulating Hormone (FSH) (C)</p> Signup and view all the answers

What is the average volume of semen produced during ejaculation?

<p>2-5 mL (C)</p> Signup and view all the answers

What happens to the endometrium during the premenstrual phase if fertilization does not occur?

<p>It degenerates rapidly (B)</p> Signup and view all the answers

What is the role of the acrosome found in the head of the sperm?

<p>Enzyme release for egg penetration (C)</p> Signup and view all the answers

What are the three main parts of the uterus?

<p>Fundus, Body, Cervix (B)</p> Signup and view all the answers

Which layer of the uterus is primarily responsible for contractions during childbirth?

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

Which characteristic of the vagina helps maintain its acidic environment?

<p>Presence of glycogen (A)</p> Signup and view all the answers

What is the function of the paraurethral glands?

<p>Secrete mucus similar to prostatic fluid (D)</p> Signup and view all the answers

During which phase of spermatogenesis do primary spermatocytes divide?

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

What determines the size of a woman's breasts?

<p>The quantity of subcutaneous fat (D)</p> Signup and view all the answers

What is the main role of the functional layer of the endometrium?

<p>Facilitating implantation of the embryo (A)</p> Signup and view all the answers

How long does it take for a daughter cell to mature into a spermatozoon?

<p>74 days (A)</p> Signup and view all the answers

What type of epithelium lines the vagina?

<p>Non-keratinized stratified squamous epithelium (C)</p> Signup and view all the answers

The structure primarily responsible for milk transport in the breast is called what?

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

What is the primary function of the kidneys in the urinary system?

<p>Formation of urine (C)</p> Signup and view all the answers

Which structure of the nephron is primarily involved in filtering blood plasma?

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

What role does aldosterone play in the urinary system?

<p>Stimulates sodium reabsorption (A)</p> Signup and view all the answers

Which part of the kidney connects the renal pelvis to the bladder?

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

What percentage of filtrate is typically reabsorbed in the proximal convoluted tubule?

<p>65% (D)</p> Signup and view all the answers

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

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

What happens to the glomerular filtration rate with conditions like chronic hypertension?

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

Which layer of muscle is primarily responsible for urine expulsion from the bladder?

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

Where does the process of urine formation start within the nephron?

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

The renal pelvis functions primarily to:

<p>Collect urine from the kidney (C)</p> Signup and view all the answers

What term describes the condition of producing more than 2 liters of urine per day?

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

Which part of the nephron is responsible for the high permeability to water?

<p>Henle's loop (B)</p> Signup and view all the answers

In which area of the bladder is infection most likely to occur?

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

What initiates the process of micturition?

<p>Stretch receptors in the bladder wall (D)</p> Signup and view all the answers

What is the length of the female urethra?

<p>3-4 cm (A)</p> Signup and view all the answers

Which of the following contributes to the chemical composition of urine?

<p>95% water and 5% solutes (D)</p> Signup and view all the answers

What role does the internal urethral sphincter play in urination?

<p>It prevents involuntary urine leakage (D)</p> Signup and view all the answers

What aspect of urine is typically pH neutral?

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

What muscle type is the external urethral sphincter primarily composed of?

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

Flashcards

Urinary System

The system responsible for filtering waste products from the blood and removing them from the body as urine.

Kidney (Nephron)

The primary organ in the urinary system, responsible for filtering blood and producing urine. A nephron is the functional unit within the kidney.

Renal Corpuscle

Part of the nephron, consisting of the glomerulus (a network of capillaries) and Bowman's capsule. It filters blood plasma.

Glomerulus

A network of capillaries inside the renal corpuscle that filters blood.

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Nephron Loop (Henle's Loop)

Part of the nephron that plays a crucial role in reabsorbing water and electrolytes from the filtrate in the kidney.

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Proximal Convoluted Tubule

The portion of the nephron where the majority of essential substances are reabsorbed back into the bloodstream.

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Distal Convoluted Tubule

Part of the nephron where further reabsorption and secretion of specific substances occurs. Influenced by hormones like aldosterone.

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Collecting Duct

The final part of the nephron where urine is concentrated and transported to the renal pelvis.

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Glomerular Filtration Rate

The rate at which blood is filtered by the glomeruli in the kidneys. A key indicator of kidney health.

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Urine Formation

The process by which the kidneys filter blood, reabsorb necessary substances, and excrete waste products to form urine.

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Ureters function

The tubes that carry urine from the kidneys to the bladder.

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Ureter length

Approximately 25cm long.

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Ureter structure

Have a mucous lining to prevent backflow of urine when the bladder contracts.

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Ureter peristalsis

The muscular contraction that pushes urine through the ureter.

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Urinary bladder function

A muscular sac that stores urine.

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Detrusor muscle function

Contracts to expel urine.

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Urinary bladder capacity

Typically holds 500ml, but can expand to 700-800 ml.

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Micturition definition

The process of urination or expelling urine.

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Internal urethral sphincter

Smooth muscle that involuntarily controls urine flow.

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Urinary incontinence

Inability to control the bladder function.

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Gametes

Specialized reproductive cells (sperm and egg) that carry genetic information to create offspring.

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Sperm

The male gamete, a small, mobile cell that travels to fertilize an egg.

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Ovum (Egg)

The female gamete, a large cell containing nutrients to support a developing embryo.

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Gonads

Primary sex organs responsible for producing gametes (sperm or eggs) and sex hormones.

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Testes

Male gonads that produce sperm and testosterone.

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Ovaries

Female gonads that produce eggs and estrogen and progesterone.

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Seminiferous Tubules

Tiny tubes within the testes where sperm cells are produced.

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Epididymis

A coiled tube on the back of the testes where sperm mature and are stored.

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Ductus Deferens (Vas Deferens)

A muscular tube connecting the epididymis to the urethra, transporting sperm during ejaculation.

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Ovulation

The release of a mature egg from the ovary.

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Uterus

A hollow, pear-shaped organ in the female reproductive system, where a fertilized egg implants and a fetus develops. It is responsible for menstruation and childbirth.

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Cervix

The lower, narrow end of the uterus that connects to the vagina. It plays a role in regulating the passage of sperm and the expulsion of a baby during childbirth.

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Endometrium

The inner lining of the uterus, composed of two layers: the functional layer and the basal layer. It is shed during menstruation and provides a nourishing environment for a fertilized egg.

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Myometrium

The thick muscular wall of the uterus, composed of smooth muscle. It contracts during childbirth to push the baby out.

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Vagina

A muscular canal that connects the uterus to the outside of the body. It serves as the birth canal and allows for menstrual flow.

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Vulva

The external female genitals, which includes the labia (outer and inner lips), clitoris, and vaginal opening.

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Clitoris

A sensitive organ at the front of the vulva that is highly sensitive to sexual stimulation. It is analogous to the male penis.

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Breast

A soft, glandular tissue that develops in females during puberty. It produces milk for breastfeeding.

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Areola

The darkened area around the nipple of the breast. It contains small glands that secrete lubricant during breastfeeding.

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Lactiferous Ducts

Tubules that carry milk from the mammary glands to the nipple for breastfeeding.

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Acrosome

A cap-like structure at the head of a sperm that contains enzymes to break down the outer layers of an egg.

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Semen

A fluid containing sperm and other secretions that is ejaculated during sexual intercourse.

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Oogenesis

The process of producing a female reproductive cell, or egg.

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Folliculogenesis

The process of follicle development in the ovary, from primordial follicle to mature follicle.

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Ovarian Cycle

A monthly cycle in females that includes follicle development, ovulation, and corpus luteum formation.

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Corpus Luteum

A temporary endocrine gland formed after ovulation, secreting hormones like progesterone.

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Menstrual Cycle

A monthly cycle in females that involves changes in the lining of the uterus, leading to menstruation.

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Progesterone

A hormone produced primarily by the corpus luteum, plays a role in preparing the uterus for pregnancy.

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Study Notes

Urinary System Overview

  • Composed of kidneys, ureters, urinary bladder, and urethra
  • Kidneys: filter blood and produce urine
  • Filtration rate: 90-120ml/minute
  • Functions include waste removal, fluid balance, and electrolyte regulation
  • Kidneys also produce hormones (e.g., renin for blood pressure, erythropoietin for red blood cell production) that impact bone health

Urinary System Structure

  • Kidneys lie between the 12th rib and 3rd lumbar vertebra, slightly lower on the left side.
  • Renal sinus: the cavity within each kidney where urine collects
  • Renal cortex: the outer layer
  • Renal medulla: the inner layer
  • Renal pelvis: collecting area for urine that leads to the ureters

Nephron Structure

  • Functional unit of the kidney
  • Consists of renal corpuscle (glomerulus and Bowman's capsule) and renal tubule
  • Renal corpuscle filters the blood
  • Renal tubule reabsorbs essential substances & secretes waste
  • Includes proximal convoluted tubule, loop of Henle, distal convoluted tubule and collecting duct

Urinary System-Ureters

  • Tubes that carry urine from the kidneys to the bladder
  • Peristaltic movement aids urine transport

Urinary System-Urinary Bladder

  • Stores urine until it's excreted
  • Has a significant capacity 500-800ml

Urinary System-Urethra

  • Tube that carries urine out of the body
  • Structure differs between genders

Reproductive System Overview

  • Has primary sex organs and accessory structures
  • Primary: the gonads (testes in males and ovaries in females)
  • Accessory: include the ducts and glands, as well as the external genitalia

Reproductive System-Male Reproductive System

  • Testes: produce sperm and testosterone
  • Ducts: carry sperm from the testes to the outside
  • Accessory glands: provide fluids to nourish sperm

Reproductive System-Female Reproductive System

  • Ovaries: produce eggs and estrogen
  • Ducts: transport the egg from the ovary to the uterus
  • Accessory structures: uterus, fallopian tubes, vagina.

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Description

Explore the intricate anatomy and functions of the urinary system, including the roles of kidneys, ureters, urinary bladder, and urethra. This quiz covers key components such as nephron structure and filtration processes, vital for maintaining fluid balance and electrolyte regulation.

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