Tissue damage can trigger local release of histamine, which can
A. stimulate release of nitric oxide, a vasodilator.
B. stimulate release of nitric oxide, a vasoconstrictor.
C. inhibit release of nitric oxide, a vasodilator.
D. inhibit release of nitric oxide, a vasoconstrictor.
A
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Olfactory receptors
a. are specialized endings of afferent neurons, not separate cells. b. when stimulated send impulses both to the limbic system for coordination between smell and behavior and to the thalamus and cortex for perception of smell. c. are replaced about every two months. d. both (a) and (b) above. e. all of these answers.
What forms the matrix of blood?
A. Hyaluronic acid B. Glycoproteins C. Collagen fibers D. Fluid
Cholinergic synapses use the neurotransmitter:
A) epinephrine. B) serotonin. C) norepinephrine. D) acetylcholine.
Which of the following does NOT aid in giving the internal surface of the small intestine a larger surface area?
A. Microvilli B. Rugae C. Villi D. Circular folds