Mas pero en Ingles

Fertilization

A) usually occurs in the uterus.
B) unites the sperm and secondary oocyte pronuclei into one diploid nucleus.
C) usually occurs 5 to 7 days after ovulation.
D) is the penetration of the secondary oocyte by a single sperm.
E) is the penetration of the secondary oocyte by multiple sperm.


Which of the following is correct?

A) Gonads produce gametes and secrete sex hormones.
B) Ducts store and transport gametes.
C) Accessory glands produce substances that protect the gametes and facilitate their movement.
D) A and B are correct.
E) A, B and C are correct.


Which of the following is NOT part of the male reproductive system?

A) prostate gland
B) epididymis
C) vestibular gland
D) bulbourethral gland
E) testis


The scrotum

A) regulates the temperature of the testes.
B) is a single pouch of skin containing both testes.
C) contains detrusor muscles that wrinkle the scrotum and elevates the testes.
D) contains cremaster muscles that lower the testes.
E) All of these are correct.

Sertoli (sustentacular) cells do all of the following EXCEPT:

A) nourish spermatocytes, spermatids, and sperm.
B) phagocytize excess spermatid cytoplasm.
C) produce fluid for sperm transport.
D) mediate the effects of testosterone and LH.
E) secrete androgen-binding protein and the hormone inhibin.

Which of the following cells develops first?

A) primary spermatocyte
B) secondary spermatocyte
C) spermatogonium
D) spermatid
E) sperm cell

Sperm production

A) takes over two months to complete.
B) yields about 300 million sperm per day.
C) occurs in response to FSH.
D) yields cells that a head capped by an acrosome, a middle piece full of mitochondria, and a tail.
E) All of these are correct.


) Testosterone and dihydrotestosterone do each of the following EXCEPT:

A) bind to the different receptors.
B) stimulate development of male reproductive structures in an embryo.
C) bring about development and enlargement of the male sex organs.
D) bring about development of masculine secondary sexual characteristics.
E) stimulate protein synthesis.