Which two organ systems are involved with circulation within the body?
A) digestive and urinary systems
B) nervous and endocrine systems
C) respiratory and digestive systems
D) cardiovascular and lymphatic systems
E) cardiovascular and respiratory systems
Answer: D
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The external genitalia do not become clearly differentiated until about week ________ of development.
A. 6 B. 32 C. 20 D. 38 E. 12
Valves in lymphatic vessels resemble those of veins and allow the movement of fluid in ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a sign of a healthy egg?
a. a small air cell c. albumin clings to yolk b. a yellow yolk d. all of the above
All of the following are potential locations for hematopoiesis in the embryo and fetus, except
A. the yolk sac. B. the placenta. C. the red bone marrow. D. the lymph nodes. E. the spleen.