Which cells are involved in both humoral and cellular immunity?
A. Memory cells
B. Plasma cells
C. Thelper cells
D. Tcytotoxic cells
Answer: C
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Hard masses composed of cholesterol and calcium carbonate called __________ can obstruct the bile ducts and cause excruciating pain.
Fill in the blank(s) with the appropriate word(s).
Sweat
A. reaches the body only through the hair follicles. B. is not associated with emotions. C. contains only water. D. is produced by a merocrine or apocrine gland. E. is a hypertonic fluid.
The entire epidermis is replaced every ________.
A. 2 weeks B. 2-3 hours C. 2-3 days D. 2 months
Which of the following structures contains central pattern generators that help regulate the breathing rhythm?
A. Pons B. Thalamus C. Forebrain D. Cerebellum E. Limbic system