After an infection, many dead and fragmented bacterial cells must be filtered from the body. Which of the following cells will clear out the cell debris?
A. Macrophages
B. Mast cells
C. Lymphocytes
D. Cytokines
Answer: A
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When comparing the dermis with the hypodermis, the dermis
A. is a more vascular tissue than the hypodermis. B. and the hypodermis do not contain collagen. C. contains melanocytes; the hypodermis does not. D. is divided into two layers; the hypodermis is not. E. has more fat cells than the hypodermis.
Solution 1 has a higher concentration of NaCl than solution 2 . A membrane permeable only to Na+ and water separates the two membranes. Which of the following is true?
a. Na+ will diffuse into solution 2 until the two solutions become isotonic. b. Solution 2 has a higher osmolarity. c. A membrane potential will develop, with the negative side being in solution 1. d. Solution 2 will gain water from solution 1. e. Eventually, solution 2 will contain only Na+ and solution 1 will contain only Cl-
What do lutein cells develop from?
A. The corpus luteum B. The granulosa cells C. The corona radiata D. The corpus albicans E. The theca interna
Which of the following is true? a. Drugs with short half-lives need not be given more frequently
b. Noncompetitive antagonists are easily reversed in a clinical setting. c. Thin animals with low plasma protein levels require more drug than an animal of normal weight. d. Giving fluids to an animal will increase the excretion of drug.