Chapter 20

Instructions

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The following statements apply to sexual reproduction in man:

a) A mature sperm contains a full complement of chromosomes.

b) Primary and secondary spermatocytes divide by mitosis to give rise to spermatids.

c) At birth, an ovary contains all the oocytes it will ever have.

d) The sperm are known as male zygotes.

In the testis:

a) Sertoli cells permit free diffusion of water-soluble substances between the seminiferous tubules and the blood.

b) Leydig cells secrete testosterone.

c) Sertoli cells respond to testosterone by synthesising androgen binding protein.

d) Sertoli cells line the seminiferous tubules and directly give rise to the developing sperm.

During the ovarian cycle:

a) The first part of the menstrual cycle is known as the luteal phase.

b) The initiation of the preantral phase of follicular development is under the control of LH.

c) The development of the antral follicle depends on the expression of receptors for FSH and LH.

d) Ovulation occurs in response to a sudden increase in plasma FSH.

The following statements relate to the hormonal control of the menstrual cycle:

a) The myometrium proliferates under the direct influence of LH and FSH.

b) Estrogens are synthesized mainly by the cells of the theca interna.

c) After ovulation, the ruptured follicle is converted into a corpus albicans which secretes progesterone.

d) Progesterone promotes full development of the endometrium.