Undifferentiated spermatogenic cells are called

• spermatogonia.

• primary spermatocytes.

• secondary spermatocytes.

• spermatids.

The hormone responsible for the development and maintenance of male secondary sexual characteristics is

• ICSH.

• FSH.

• testosterone.

• gonadotropin-releasing hormone.

The female structure that corresponds to the male penis is the

• vagina.

• clitoris.

• vestibule.

• labia minora.

The hormone mainly responsible for the development and maintenance of female secondary sexual characteristics is

• estrogen.

• progesterone.

• androgen.

• luteinizing hormone.

The tubular portion of the uterus that extends downward into the upper part of the vagina is the

• ostium uteri.

• cervix.

• perimetrium.

• endometrium.

Meiosis occurs during

• spermatogenesis only.

• oogenesis only.

• both spermatogenesis and oogenesis.

• neither spermatogenesis nor oogenesis.

The cells in the testis that produce male sex hormones are called

• spermatogenic cells.

• interstitial cells.

• germinal epithelial cells.

• seminiferous cells.

In spermatogenesis, meiosis results in the formation of

• one sperm cell with 23 chromosomes.

• two sperm cells with 46 chromosomes each.

• four sperm cells with 23 chromosomes each.

• four sperm cells with 46 chromosomes each.

In the female reproductive cycle, menstrual flow occurs when the concentrations of

• estrogen and progesterone are low.

• estrogen and progesterone are high.

• estrogen is high and progesterone is low.

• progesterone is high and estrogen is low.

How long can a sperm cell be viable in the woman's vagina?

• 1 day

• 14 days

• 3 days

• 5 days