Pulmonary surfactant
a. is secreted by Type II alveolar cells.
b. decreases surface tension of the fluid lining the alveoli.
c. resists elastic recoil of the lungs.
d. is a combination of lipoproteins.
e. all of these answers.
E
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Helper T cells do all of the following except
A) activate sensitized B cells by costimulation. B) destroy target cells using perforins. C) enhance cell-mediated immunity. D) secrete cytokines to stimulate production of plasma cells. E) enhance antibody-mediated immunity.
In a neuron, the opening of sodium gates typically leads to ________.
A. depolarization of the plasma membrane B. plasma membrane voltage returning to the resting membrane potential C. drifting of plasma membrane voltage toward a more negative value D. hyperpolarization of the plasma membrane E. repolarization of the plasma membrane
Which of the following ions acts as a buffer to minimize changes in intracellular pH?
A) sodium B) chloride C) bicarbonate D) potassium E) phosphate
Sperms are stored in which of the following structures?
a. Seminiferous tubules b. Urethra c. Epididymis d. Ductus deferens e. Ejaculatory duct