IB Human Anatomy Chapter 25

During the proliferative phase of the uterine cycle, these vessels grow and proliferate. A. spiral arteries B. straight arteries C. radial arteries D. arcuate arteries

A. spiral arteries

The epithelium lining the vagina is A. stratified squamous. B. simple squamous. C. simple columnar. D. pseudostratified columnar.

A. stratified squamous.

At what point during fetal development are the decidua basalis and chorionic villi collectively referred to as the placenta? A. the start of fourth month B. the first month C. the ninth month D. the end of second month

A. the start of fourth month

The typical (diploid) cells of the body have 46 chromosomes; how many chromosomes does each gamete have? A. 46 B. 23 C. 184 D. 46 pairs

B. 23

In breast cancer, the cancer cells usually originate from the A. endothelium of the lymph vessels in the breasts. B. lactiferous ducts. C. fat cells in the breast. D. cuboidal acinar cells.

B. lactiferous ducts.

In an adult woman who has never been pregnant, the breasts have poorly developed or no A. areolar glands. B. lobules of acini/alveoli. C. lactiferous sinuses. D. suspensory ligaments.

B. lobules of acini/alveoli.

Most support of the uterus is provided by the A. round ligament. B. muscles of the pelvic floor. C. transverse cervical (cardinal) ligament. D. mesometrium.

B. muscles of the pelvic floor.

Hypospadias A. cannot be detected through an examination of the outside of a baby's body. B. never occurs in females. C. is characterized by the absence of a urethra. D. has no effects until puberty, when males start producing sperm.

B. never occurs in females.

The correct sequence of sperm-transporting tubules that transport spermatozoa to the epididymis is A. seminiferous tubule to efferent ductule to straight tubule to rete testis. B. seminiferous tubule to straight tubule to rete testis to efferent ductule. C. seminiferous tubule to rete testis to efferent ductule to straight tubule. D. seminiferous tubule to rete testis to straight tubule to efferent ductule.

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

Which of the following occurs when the testes do not descend into the scrotum before birth? A. Male sex hormones will not circulate in the body. B. Inadequate blood supply will retard the development of the testes. C. Viable sperm will not be produced. D. Sperm will have no route of exit from the body.

C. Viable sperm will not be produced.

The function of the cremaster muscle is to A. increase intra-abdominal pressure during childbirth. B. maintain erection in both sexes. C. alter the position of the testes in the scrotal sac with increases in ambient temperature. D. squeeze semen from the urethra during ejaculation.

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

Which of the following statements about pelvic inflammatory disease is incorrect? A. It inhibits ovulation. B. It can lead to sterility. C. It includes salpingitis. D. It is usually caused by chlamydia or gonorrhea.

A. It inhibits ovulation.

Inguinal hernias A. always enter the inguinal canal. B. occur with equal frequency in males and females. C. are signs of old age and almost never congenital. D. always reach the scrotum.

A. always enter the inguinal canal.

The ________ is the fluid-filled cavity in a mature ovarian follicle. A. antrum B. zona pellucidum C. corona radiate D. granulosa E. follicular theca

A. antrum

In the early fetus, all of the following are parts of the chorionic villi except the A. decidua. B. cytotrophoblast. C. extraembryonic mesoderm. D. syncytiotrophoblast.

A. decidua.

Sperm become motile in the A. epididymis. B. seminiferous tubules. C. ductus deferens. D. prostate.

A. epididymis.

The capillaries within a chorionic villus of the placenta contain blood A. from the fetus. B. from the ovarian artery. C. from both the fetus and the mother. D. from the mother.

A. from the fetus.

The acrosomal reaction occurs A. just before fertilization. B. during placentation. C. during spermiogenesis. D. during meiosis of the sperm.

A. just before fertilization.

The female uterine cycle begins A. on the first day of menstruation. B. at ovulation. C. every six weeks. D. at the end of menstruation

A. on the first day of menstruation.

The seminal vesicles A. secrete digestive enzymes when cancerous. B. are glands that secrete most of the volume of the semen. C. store sperm. D. empty into the epididymis.

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

Erection is caused by A. the penis filling up with semen that is about to be ejaculated. B. erectile bodies filling with blood. C. a jointed bone in the penis that unfolds. D. impulses from the sympathetic nervous system.

B. erectile bodies filling with blood.

By undergoing meiosis, each primary spermatocyte ultimately gives rise to how many sperm cells? A. eight B. four C. two D. billions

B. four

The cells that secrete estrogens in females are A. oocytes. B. granulosa cells. C. cells in the pituitary gland. D. germinal epithelium of the ovary.

B. granulosa cells.

The function of the pampiniform plexus of veins is to A. form hydroceles. B. help cool blood. C. form the outer wall of the spermatic cord. D. help prevent hernias.

B. help cool blood.

A hydrocele A. is a series of varicosities of the pampiniform plexus. B. is excess serous fluid in the scrotum. C. is an outpocketing of peritoneum and intestines that have pushed through the abdominal wall. D. occurs in females only.

B. is excess serous fluid in the scrotum.

All of the following are adaptations for keeping the testes cool except the A. cremaster and dartos muscles. B. testicular artery. C. pampiniform plexus of veins. D. descent of the testes into the scrotum before birth.

B. testicular artery.

Sperm are moved from the testis into the epididymis by A. swimming under their own power. B. testicular fluid moved by cilia and smooth muscle cells. C. suction. D. gravity.

B. testicular fluid moved by cilia and smooth muscle cells.

The most common site of ectopic pregnancy is the A. uterus. B. uterine tube. C. peritoneal cavity. D. vagina.

B. uterine tube.

The zona pellucida is A. the remnant of the vesicular follicle that becomes the corpus luteum. B. the portion of the placenta in which maternal blood contacts fetal tissues. C. the region of the uterine tube where fertilization occurs. D. a protective shell around the oocyte that sperm must penetrate for fertilization to occur.

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

Tubular organ that is transected during a vasectomy. A. spermatic cord B. pampiniform plexus C. epididymis D. ductus deferens E. rete testis

D. ductus deferens

Which of the following is not contained in the fluid secreted by the seminal glands? A. fructose B. prostaglandins C. a fluorescent pigment D. macrophages

D. macrophages

Which testicular cells help deliver sperm to the epididymis by contracting rhythmically? A. sustentocytes B. interstitial C. type A spermatocytes D. myoid

D. myoid

One factor that propels an oocyte through the uterine tube is A. amoeboid motion of the oocyte. B. pressure exerted by ovarian fluid. C. secretions of the non-ciliated cells. D. smooth muscle contraction (peristalsis)

D. smooth muscle contraction (peristalsis)

The vaginal fornix A. is in the superior part of the vestibule. B. surrounds the external vaginal orifice. C. is in the middle layer of the vaginal wall. D. surrounds the tip of the cervix.

D. surrounds the tip of the cervix.

Fingerlike placental structures where oxygen and nutrients from the maternal blood supply diffuse into the embryonic blood. A. syncytiotrophoblast B. amnion C. allantois D. extraembryonic membranes E. chorionic villi

E. chorionic villi

Involuntary contraction of this smooth muscle layer wrinkles and thickens the walls of the scrotum to prevent heat loss. A. tunica albuginea B. internal spermatic fascia C. cremaster muscle D. tunica vaginalis E. dartos muscle

E. dartos muscle

The opening of the oviduct is surrounded by these structures. A. internal os B. external os C. isthmus D. transverse cervical (cardinal) ligaments E. fimbriae

E. fimbriae

This multinucleate embryonic structure invades the uterus, digesting cells and maternal blood vessels to make way for development of the placenta. A. decidua basalis B. morula C. decidua capsularis D. inner cell mass E. syncytiotrophoblast

E. syncytiotrophoblast

An episiotomy during childbirth is performed to A. eliminate the pain to the mother. B. prevent the anal canal from being crushed. C. minimize tearing of the central tendon and muscles of the pelvic floor. D. save the baby's life.

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

This layer of the uterus contracts during parturition to expel the baby. A. stratum basalis B. perimetrium C. myometrium D. stratum functionalis E. endometrium

C. myometrium

Tubules that connect testicular lobules with the efferent ductules of the epididymis. A. straight tubules B. ductus deferens C. rete testis D. seminiferous tubules E. pampiniform plexus

C. rete testis

Which of the following anchors the uterus into its anteverted position in the pelvis? A. ovarian ligament B. suspensory ligament C. round ligament D. broad ligament

C. round ligament

All of the following are functions of the sustentocytes in the seminiferous tubules except A. secretion of testicular fluid. B. secretion of androgen-binding protein. C. secretion of testosterone. D. phagocytosis of excess cytoplasm from spermatids during spermiogenesis.

C. secretion of testosterone.

The ________ phase of the uterine cycle occurs after ovulation. A. proliferative B. luteal C. secretory D. menstrual

C. secretory

The milk-producing cells in the breast are A. columnar epithelial cells in lobules. B. endocrine cells. C. simple cuboidal epithelial cells in alveoli. D. adipose cells (because milk contains 4% fat).

C. simple cuboidal epithelial cells in alveoli.

All of the following are located within the spermatic cord except the A. testicular artery. B. pampiniform plexus. C. superficial inguinal ring. D. ductus deferens.

C. superficial inguinal ring.

Which of the following is the primary sex organ in the male? A. epididymis B. penis C. testis D. prostate

C. testis

The structural basis of the blood-testis barrier is A. the thick basal lamina around the capillaries that supply the seminiferous tubules. B. the basal lamina around the seminiferous tubules. C. the tight junctions between sustentocytes. D. the endothelial cells of the continuous (non-fenestrated) capillaries that supply the seminiferous tubules.

C. the tight junctions between sustentocytes.

In addition to the remaining granulosa cells, which of the following cell types make up the corpus luteum? A. interstitial cells B. oocyte C. theca cells D. cells of the corona radiata

C. theca cells

In which part of the uterine tube does fertilization usually occur? A. It doesn't occur in the uterine tubes. B. isthmus C. ampulla D. infundibulum

C. ampulla

The placenta consists of which two structures? A. cytotrophoblast and syncytiotrophoblast B. chorionic villi and amnion C. chorionic villi and decidua basalis D. decidua basalis and decidua capsularis

C. chorionic villi and decidua basalis

Which of the following organs does not contribute secretion(s) during the male sexual response? A. bulbourethral glands B. seminal vesicles C. corpus cavernosum D. prostate

C. corpus cavernosum

The ovarian cortex consists of A. the hilus of the ovary. B. the mesovarium. C. follicles and connective tissue. D. the largest blood vessels of the ovary.

C. follicles and connective tissue.