Which of the following statements about larger lymphatics is incorrect?
A. They have valves.
B. They have thicker walls than veins.
C. The tunica media has smooth muscle and elastic fibers.
D. The endothelium of the tunica interna is similar to that of veins.
E. The tunica externa is relatively thin.
Answer: B
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Adrenocorticotropic hormone
a. is a tropic hormone secreted by the adrenal cortex b. stimulates the production of androgens by the testes c. is controlled in part by CRH from the hypothalamus d. has characteristics a and b e. has characteristics b and c
____________________ is the bending of light rays as they pass from one medium to another
Fill in the blank(s) with correct word
Hematocrit is the percentage of ____ in a blood sample.
Fill in the blank(s) with the appropriate word(s).
Which of the following would not lead to polycythemia?
A. Excessive aerobic exercise B. Iron deficiency C. Dehydration D. Emphysema E. Cancer of the erythropoietic line of the red bone marrow