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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

During spermatogenesis in mammals, sperm travels from the:

a. Sertoli cells past the epididymis and urethra, through the vas deferens to the prepuce.

b. seminal vesicles past the prostate gland, through the glans and prepuce to the bulbourethral glands.

c. vestibular glands past the Leydig cells, through the accessory glands and epididymis to the vas deferens.

d. labia past the bulbourethral glands, through the vas deferens and urethra to the epididymis.

e. seminiferous tubules past the Sertoli cells, through the epididymis and vas deferens to the urethra.

Summary Introduction

Introduction:

Sperms are produced in testes. Testicles are contained in a pouch-like structure known as scrotum, which provides the testicle an optimum temperature for sperm production. The optimum temperature for sperm production is 2–3 degrees less than the normal body temperature. Ejaculation of sperm from urethra consists of various secretions from other glands also to provide proper pH and ease in motility.

Explanation

Justification/explanation for the correct answer:

Option (e) states that seminiferous tubules pass the Sertoli cells, through the epididymis and vas deferens to the urethra. The pathway of semen is from testes where they are produced to the seminiferous tubules. The sperm cells are stored in the epididymis where they get matured. The ejaculation begins when the penis is filled with blood, and erects. Furthermore, from epididymis, they travel to the vas deferens, which by smooth contractions allows the smooth movement of sperms. The sperm reaches to the ampulla where addition of secretions of seminal vesicles takes place, followed by the addition of secretions of the prostate gland, which give semen milky texture. The semen finally pass off from the urethra. Hence, option (e) is correct.

Explanation for the incorrect answers:

Option (a) states that Sertoli cells pass the epididymis and urethra, through the vas deferens to the prepuce. The urethra is the final opening where the semen is ejaculated from. Epididymis surrounds the seminiferous tubules, which follow the vas deferens...

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