Movement of particles from higher to lower concentrations through a membrane, such as in dialysis, occurs by _____.
A) diffusion
B) active transport
C) osmosis
D) filtration
Ans: A) diffusion
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Which type of compound does not dissolve readily in water?
a. polar b. ionic c. electrolytic d. nonpolar
In emphysema, all of the following occur except
A) alveoli collapse. B) compliance increases. C) there is elevated PCO2 in the blood. D) the surface area for gas exchange decreases. E) patients present with cyanosis.
In the case of most neurons, the arrival of a nerve impulse at the terminal bouton immediately triggers
A) long-lived effects at the synaptic membrane. B) a change in the permeability of the postsynaptic plasmalemma. C) release of ACh at the presynaptic membrane. D) an action potential. E) generation of an action potential in the axon.
Approximately 10-15 percent of the circulating lymphocytes are
A) B cells. B) NK cells. C) T cells. D) macrophages. E) None of the answers are correct.