Q31 in a human spermatozoan, Select one: The head contains 23 chromosomes. The h

Question

Q31

in a human spermatozoan,

Select one:

The head contains 23 chromosomes.

The head is diploid.

The tail contains the mitochondria.

The midpiece contains the chromosomes.

The acrosome is next to the flagellum.

Question 32

When it is cold, the cremaster muscles relax and lower the testicles away from the body

Select one:

True

False

Question 33

Which of the following glands are responsible for 70% of the synthesis of semen?

Select one:

a. the pituitary

b. the bulbourethral glands

c. the prostate

d. the seminal vesicles

Question 34

Select the correct statement about testosterone control:

Select one:

a. The pineal gland is believed to be the gland that exerts the most influence in testosterone control

b. GnRH from the hypothalamus causes FSH and LH release from the anterior pituitary

c. FSH stimulates testicular production of testosterone

d. Inhibin and testosterone exert positive feedback on the hypothalamus and pituitary

Question 35

A male bodybuilder starts taking injection of testosterone (an anabolic steroid) on a daily basis. After several weeks, which of the following changes would you expect to observe?

Select one:

All of the given answers are correct.

Decreased levels of LH and FSH

Increased sex drive

Decreased levels of GnRH

Increased muscle mass

Explanation / Answer

31. The sperm is male reproductive cell and consists of head, mid piece and tail.

The sperm head contains the nucleus which is composed of the chromosomes.

Human sperm is haploid

So the answer is the head contains 23 chromosomes.

32. The cremastor muscles contract to bring the testes closer to the body when it is cold.

If it is hot cremastor muscles relax and takes testes away from body.

So the statement is false

33. Seminal vesicles are tubular glands present in human males.

They are located posteroinferior to the urinary bladder.

They produce fluid that later develops into sperm.

The answer is seminal vesicle

34. Testosterone is male sex hormone.

The answer is (b) GnRH from the hypothalamus causes FSH and LH release from the anterior pituitary

35. Testosterone injections cause decrease in LH, FSH and GnRH.

It also increases sex drive and muscle mass

So the answer is all the answers are correct.

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