T cells bind to antigens that have been engulfed, digested, and presented on the surface of a(n) ____
a. macrophage
b. basophil
c. eosinophil
d. monocytes
Answer: a. macrophage
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During which event are the primary germ layers formed?
A. Implantation B. Cleavage C. Conception D. Organogenesis E. Gastrulation
When you cry, your nose becomes runny because your eye fills with tears produced by the lacrimal gland. The tears drain through the superior and inferior canniculi, enter the lacrimal sac, and drain out through the ________ ________.
Fill in the blank(s) with the appropriate word(s).
The ___________ nervous system facilitates increased blood flow to the penis by facilitating local release of __________
A. sympathetic, nitric oxide B. sympathetic, norepinephrine C. parasympathetic, nitric oxide D. parasympathetic, norepinephrine E. somatic, acetylcholine
Which of the following vitamins is mismatched with its function?
A. vitamin D - bone growth B. vitamin A - rhodopsin synthesis C. folate - synthesis of clotting factors D. vitamin C - collagen synthesis E. vitamin B12 - red blood cell production