Transcript Seeley Essentials of Anatomy and Physiology 6th

Seeley
Essentials of Anatomy and Physiology
6th Edition
Chapter 20
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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. B
2. D
3. C
4. D
5. C
6. B
7. D
8. A
9. A
10. A
11. D
12. D
13. A
14. B
15. A
16. A
17. A
18. A
19. B
20. A