SeeleyEssentials of Anatomy and Physiology

6th Edition

Chapter 20

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Question 1

Sperm are able to increase their motility by lashing their tails because of the influence of

A. progesterone.

B. prostaglandins in semen.

C. high estrogen levels.

D. all of the above

Question 2

Fertilization takes place in the ________.

A. vagina

B. cervix

C. uterus

D. uterine tube

Question 3

Which of the following is thought to be the mechanism by which the sperm enters the egg?

A. An antigen-antibody reaction that briefly alters the cell membrane of the egg.

B. The structure of the cell membrane of the egg allows entry.

C. The head of the sperm has an enzyme that permits digestion through the membrane of the egg to permit a sperm to enter.

D. The mechanism is unknown.

Question 4

The stage of development that follows formation of the zygote is the

A. embryonic stage.

B. implantation stage.

C. fetal stage.

D. cleavage stage.

Question 5

The beginning of the embryonic stage is marked by the appearance of a

A. solid ball of new cells.

B. hollow ball of cells.

C. hollow ball of cells organized around an inner mass.

D. worm-like structure.

Question 6

The hormone that maintains a corpus luteum following implantation is _______.

A. LH

B. HCG

C. progesterone

D. FSH

Question 7

Female infertility may be due to

A. hyposecretion of gonadotropic hormones.

B. endometriosis.

C. scarring of the uterine tubes.

D. all of the above

Question 8

The layer of the embryonic disk that gives rise to hair, skin, and nails is

A. ectoderm.

B. endoderm.

C. mesoderm.

D. both mesoderm and endoderm.

Question 9

Which of the following structures arise from the mesoderm?

A. muscle

B. lining of the mouth

C. lining of the respiratory tract

D. epidermis

Question 10

At what time does the embryonic disk become a cylinder?

A. 4 weeks of development

B. 6 weeks of development

C. 8 weeks of development

D. 4 days of development

Question 11

The embryonic portion of the placenta is the

A. amnion.

B. fetal membrane.

C. allantois.

D. chorion.

Question 12

In the embryo, blood cells are primarily formed in the

A. amnion.

B. placenta.

C. allantois.

D. yolk sac.

Question 13

The ductus venosus shunts blood around the _______.

A. liver

B. spleen

C. pancreas

D. small intestine

Question 14

The substance secreted by the breast immediately following delivery is

A. witches' milk.

B. colostrum.

C. true milk.

D. false milk.

Question 15

The primary energy source for the newborn is _______.

A. glucose

B. glycogen

C. fatty acids

D. protein

Question 16

Sperm cells reach the upper portions of the uterine tube within an hour after ejaculation.

A. True

B. False

Question 17

The product of conception is called a fetus eight weeks after conception.

A. True

B. False

Question 18

The corpus luteum secretes both estrogen and progesterone.

A. True

B. False

Question 19

Fetal organs are not present until the end of the tenth week of development.

A. True

B. False

Question 20

Neonates younger than 24 weeks of gestation and weighing less than 600 grams have almost no chance of survival.

A. True

B. False

Answer Key

1. B2. D3. C4. D5. C6. B7. D8. A9. A10. A

11. D12. D13. A14. B15. A16. A17. A18. A19. B20. A