Chapter 23, Problem 18MC

What is the function of the hormone erythropoietin? a. stimulates production of red blood cells b. stimulates muscle growth c. causes the fight-or-flight response d. causes testosterone production

Figure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.

In which group is parthenogenesis a normal event? a. chickens b. bees c. rabbits d. sea stars

Figure 18.12 Which of the following statements about the male reproductive system is false? a. The vas deferens carries sperm from the testes to the seminal vesicles. b. The ejaculatory duct joins the urethra. c. Both the prostate and the bulbourethral glands produce components of the semen. d. The prostate gland is located in the testes.

Which of the following gives rise to the skin cells? a. ectoderm b. endoderm c. mesoderm d. none of the above

A honeybee worker is a ________. a. fertile female b. fertile male c. sterile female d. sterile male

Oral contraceptive pills work by delivering synthetic progestins to a woman every day. Describe why this is an effective method of birth control.

The slow block to polyspermy: a. is caused by a change in membrane potential from negative topositive. b. triggers the movement of Ca2+ from the cytosol to the endoplasmic reticulum. c. triggers a decrease in egg oxidation and protein synthesis. d. describes the fusion of egg and sperm nuclei. e. includes the fusion of cortical granules with the eggs plasmamembrane.

Endometriosis is a disorder in which endometrial cells implant and proliferate outside of the uterus—in the uterine tubes, on the ovaries, or even in the pelvic cavity. Offer a theory as to why endometriosis increases a woman’s risk of infertility.