Anatomy Ch 25

By undergoing meiosis, each primary spermatocyte ultimately gives rise to how many sperm cells?

4

Sperm are moved from the testis into the epididymis by

testicular fluid moved by cilia and smooth muscle cells.

The usual site of embryo implantation is the

uterus

Fingerlike placental structures where oxygen and nutrients from the maternal blood supply diffuse into the embryonic blood.

chorionic villi

The placenta consists of which two structures?

chorionic villi and decidua basalis

Which of the following organs does not contribute secretion(s) during the male sexual response?

corpus cavernosum

Involuntary contraction of this smooth muscle layer wrinkles and thickens the walls of the scrotum to prevent heat loss.

dartos muscle

Tubular organ that is transected during a vasectomy.

ductus deferens

Of the following tubular structures, which is the only one that lies partly outside the testis?

efferent ductule

Which of the following statements about pelvic inflammatory disease is incorrect?

It inhibits ovulation.

Sperm become motile in the

epididymis.

Erection is caused by

erectile bodies filling with blood

The opening of the oviduct is surrounded by these structures.

fimbriae

The female uterine cycle begins

first day of menstruation

The ovarian cortex consists of

follicles and connective tissue.

The capillaries within a chorionic villus of the placenta contain blood

from the fetus.

The cells that secrete estrogens in females are

granulosa cells

Which of the following occurs when the testes do not descend into the scrotum before birth?

Viable sperm will not be produced.

The function of the pampiniform plexus of veins is to

help cool blood.

The acrosomal reaction occurs

just before fertilization.

The female homologue of the male scrotum is the

labia majora.

The prepuce of the clitoris is formed by the

labia minora

In breast cancer, the cancer cells usually originate from the

lactiferous ducts.

In an adult woman who has never been pregnant, the breasts have poorly developed or no

lobules of acini/alveoli.

Which of the following is not contained in the fluid secreted by the seminal glands?

macrophages

The vaginal fornix

surrounds the tip of the cervix.

A woman has developed a cancerous lump in each breast, and the skin of the breasts is dimpled. What structure(s) is/are causing the dimpling?

suspensory ligaments of the breast

This multinucleate embryonic structure invades the uterus, digesting cells and maternal blood vessels to make way for development of the placenta.

syncytiotrophoblast

All of the following are adaptations for keeping the testes cool except the

testicular artery.

Which of the following is the primary sex organ in the male?

testis

A difference between a primary follicle and a primordial follicle is that

the primordial follicle has only a single layer of flat follicular cells, whereas the primary follicle is comprised of cuboidal follicle cells which multiply.

At what point during fetal development are the decidua basalis and chorionic villi collectively referred to as the placenta?

the start of fourth month

The structural basis of the blood-testis barrier is

the tight junctions between sustentocytes.

In addition to the remaining granulosa cells, which of the following cell types make up the corpus luteum?

theca cells

The most common site of ectopic pregnancy is the

uterine tube

In females, the paramesonephric ducts give rise to the

uterine tubes and uterus.

The largest region of the uterus is its

body.

The typical (diploid) cells of the body have 46 chromosomes; how many chromosomes does each gamete have?

23

The seminal vesicles

are glands that secrete most of the volume of the semen.

Hypospadias

a condition in which the opening of the urethra is on the underside of the penis instead of at the tip.

The zona pellucida is

a protective shell around the oocyte that sperm must penetrate for fertilization to occur.

A varicocele

all of the above are correct

The function of the cremaster muscle is to

alter the position of the testes in the scrotal sac with increases in ambient temperature.

Inguinal hernias

always enter the inguinal canal

In which part of the uterine tube does fertilization usually occur?

ampulla

The ________ is the fluid-filled cavity in a mature ovarian follicle.

antrum

An episiotomy during childbirth is performed to

minimize tearing of the central tendon and muscles of the pelvic floor.

Most support of the uterus is provided by the

muscles of the pelvic floor.

Which testicular cells help deliver sperm to the epididymis by contracting rhythmically?

myoid

This layer of the uterus contracts during parturition to expel the baby.

myometrium

Tubules that connect testicular lobules with the efferent ductules of the epididymis.

rete testis

Which of the following anchors the uterus into its anteverted position in the pelvis?

round ligament

All of the following are functions of the sustentocytes in the seminiferous tubules except

secretion of testosterone.

The ________ phase of the uterine cycle occurs after ovulation.

secretory

The correct sequence of sperm-transporting tubules that transport spermatozoa to the epididymis is

seminiferous tubule to straight tubule to rete testis to efferent ductule.

The milk-producing cells in the breast are

simple cuboidal epithelial cells in alveoli.

One factor that propels an oocyte through the uterine tube is

smooth muscle contraction (peristalsis).

During the proliferative phase of the uterine cycle, these vessels grow and proliferate.

spiral arteries

The epithelium lining the vagina is

stratified squamous.