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Questions and Answers
What percentage of seminal fluid is contributed by the seminal vesicles?
What percentage of seminal fluid is contributed by the seminal vesicles?
- 50%
- 60% (correct)
- 10%
- 33%
Which component is NOT found in the secretion of the seminal vesicles?
Which component is NOT found in the secretion of the seminal vesicles?
- Fructose
- Vitamin C
- Prostaglandins
- Thick alkaline mucus (correct)
What is the primary function of prostaglandins in seminal fluid?
What is the primary function of prostaglandins in seminal fluid?
- Protection of sperm
- Cleansing effect
- Promotion of sperm motility (correct)
- Nutritional support
Which gland contributes approximately 13-33% of the seminal fluid?
Which gland contributes approximately 13-33% of the seminal fluid?
What is the function of the bulbourethral gland's secretion?
What is the function of the bulbourethral gland's secretion?
What is one of the two primary products synthesized by the testes?
What is one of the two primary products synthesized by the testes?
What is the typical volume of semen produced during ejaculation?
What is the typical volume of semen produced during ejaculation?
Which structure is primarily responsible for producing sperm within the testes?
Which structure is primarily responsible for producing sperm within the testes?
What is the primary role of the scrotum in male anatomy?
What is the primary role of the scrotum in male anatomy?
What type of cells surrounds germ cells in the seminiferous tubules?
What type of cells surrounds germ cells in the seminiferous tubules?
Which of the following is NOT classified as an accessory organ of the male reproductive system?
Which of the following is NOT classified as an accessory organ of the male reproductive system?
What is the structure in the penis that fills with blood during sexual excitement?
What is the structure in the penis that fills with blood during sexual excitement?
What is the function of the scrotum in the male reproductive system?
What is the function of the scrotum in the male reproductive system?
What does the penis primarily deliver into the female reproductive tract?
What does the penis primarily deliver into the female reproductive tract?
How much lower is the scrotum's temperature compared to the body's normal temperature for optimal spermatogenesis?
How much lower is the scrotum's temperature compared to the body's normal temperature for optimal spermatogenesis?
Which accessory gland contributes to the fluid component of semen?
Which accessory gland contributes to the fluid component of semen?
What is the primary purpose of the urethra in the male reproductive system?
What is the primary purpose of the urethra in the male reproductive system?
Which of the following organs is responsible for storing sperm until they are ready for ejaculation?
Which of the following organs is responsible for storing sperm until they are ready for ejaculation?
What is the primary function of Sertoli cells in the testes?
What is the primary function of Sertoli cells in the testes?
What is the role of the ampulla in the male reproductive system?
What is the role of the ampulla in the male reproductive system?
What is transported through the urethra in males?
What is transported through the urethra in males?
What is the main function of the epididymis?
What is the main function of the epididymis?
Which cells in the testes are responsible for synthesizing testosterone?
Which cells in the testes are responsible for synthesizing testosterone?
During ejaculation, what structure propels sperm into the urethra?
During ejaculation, what structure propels sperm into the urethra?
What is the function of testicular fluid?
What is the function of testicular fluid?
Which duct connects the seminal vesicle to the urethra?
Which duct connects the seminal vesicle to the urethra?
What is the primary purpose of spermatozoa in the male reproductive system?
What is the primary purpose of spermatozoa in the male reproductive system?
Which structure aids in the ability of sperm to swim?
Which structure aids in the ability of sperm to swim?
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Study Notes
Male Reproductive System Overview
- Comprised of gonads (primary sex organs), accessory organs, gametes, and sex hormones.
- The fusion of sperm and egg results in the formation of a zygote.
Primary Sexual Characteristics
- Testis: Produces sperm and hormones, particularly testosterone.
- External Genitalia: Includes the scrotum and penis.
- Accessory Organs: Comprises the epididymis, vas deferens, urethra, and various glands.
Functions of the Testes
- Located within the seminiferous tubules, responsible for sperm production (spermatogenesis) and testosterone synthesis.
- Germ cells and Sertoli cells play crucial roles: Sertoli cells provide nourishment, produce testicular fluid, and assist in phagocytosis.
Sperm Journey and Accessory Ducts
- Epididymis: Stores and nourishes immature sperm, allowing them to mature and gain motility.
- Vas Deferens: Transports mature sperm from the epididymis to the urethra, with the ampulla serving as a sperm reservoir.
Urethra Functionality
- Serves as a conduit for both urine and sperm, with three sections: prostatic, membranous, and spongy urethra.
Semen Secretion
- Composed of secretions from seminal vesicles (60% seminal fluid), prostate gland (13-33%), and bulbourethral glands (10%).
- Seminal vesicles produce an alkaline, viscous fluid rich in fructose, Vitamin C, and prostaglandins.
- Prostate gland contributes an alkaline secretion that enhances sperm vitality.
- Bulbourethral glands produce a thick alkaline mucus for lubrication.
Sperm Concentration
- Seminal fluid volume ranges from 2-5 ml, containing 50-150 million sperm per ml.
External Genitalia Functions
- Scrotum: Regulates temperature for optimal sperm production, maintaining a temperature 3.1°C lower than normal body temperature.
- Penis: Facilitates the delivery of sperm into the female reproductive tract. Composed of erectile tissue that engorges with blood during sexual arousal, leading to erection.
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