Which is TRUE regarding the immune system cells?
A. Plasma cells are derived from T cells.
B. Macrophages are derived from basophils.
C. Macrophages are derived from monocytes.
D. The immune cells found within the bloodstream are called erythrocytes.
E. Neutrophils are classified as lymphoid cells.
C
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Which of these happens first in an adrenergic synaptic transmission?
A. ATP is converted to cyclic AMP B. G protein binds to adenylate cyclase C. Adenylate cyclase is activated D. Cyclic AMP induces several effects in the cell E. G protein dissociates from the NE receptor
Flow of air
A) is directly proportional to the resistance, and flow decreases as the pressure of the system increases. B) is directly proportional to a pressure gradient, and flow increases as the resistance of the system increases. C) is directly proportional to a pressure gradient, and flow decreases as the resistance of the system increases. D) is directly proportional to the resistance, and flow increases as the resistance of the system increases. E) None of the answers are correct.
Which of the following statements is true regarding the mechanism controlling movement of white blood cells into damaged areas?
A. White blood cells exit the capillary and move through the tissue spaces with cytoplasmic extensions by following a trail of chemicals produced by other white blood cells. B. Capillaries break open, flooding a damaged area with white blood cells. C. The damaged tissues synthesize their own white blood cells. D. None of the statements are true.
A genotype of DD is
A. heterozygous. B. homozygous recessive. C. homozygous dominant. D. heterozygous recessive.