What is one function of the type II alveolar cells?
A. production of surfactant
B. secretion of mucus
C. phagocytizing bacteria and other foreign particles
D. make up the majority of the epithelial wall of the alveoli
E. lining the pleural space
A
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Why does exposure to sunlight or sunlamps darken skin?
A) UV radiation stimulates melanocytes to produce more melanin. B) UV radiation stimulates melanocytes to produce more melatonin. C) UV radiation stimulates keratinocytes to produce more carotene. D) UV radiation stimulates keratinocytes to produce more keratin. E) UV radiation stimulates melanocytes to produce more melanin and keratinocytes to produce more keratin.
Sensory neurons ________.
A. are bipolar, and carry impulses away from the CNS B. are multipolar, and carry impulses toward the CNS C. are pseudounipolar, and carry impulses toward the CNS D. are multipolar, and carry impulses away from the CNS
Arrange the following events of exocytosis in the correct sequence:
(1) vesicle membrane fuses with plasma membrane (2) secretory vesicles migrate to plasma membrane (3) vesicle contents are expelled from cell (4) secretions accumulate within secretory vesicles A. 1, 4, 2, 3 B. 2, 1, 4, 3 C. 1, 2, 3, 4 D. 4, 2, 1, 3 E. 3, 1, 4, 2
When normal buffer mechanisms are overwhelmed by excessive numbers of hydrogen ions, which of the following will result?
A. acidosis B. alkalosis C. neither of these