In terms of their chemical structure, cytokines are ________; their function is to serve as ________.
A. proteins; receptors
B. steroids; chemical messengers.
C. steroids; receptors.
D. proteins; chemical messengers
Answer: D
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What is the advantage of transmitting information by an electrical synapse?
A) Hormone free B) Chemical free C) Fast recovery D) Less toxicity
The arrector pili muscles receive their sympathetic innervation via the
A. splanchnic nerve pathway. B. adrenal medulla pathway. C. postganglionic sympathetic nerve pathway. D. spinal nerve pathway. E. None of the choices is correct.
What is the primary method by which materials such as O2, CO2, and nutrients are exchanged between the blood and surrounding tissues?
a. passive diffusion across the capillary wall down their concentration gradients b. active transport across the capillary wall c. osmotic pressure drawing water and solutes out of the capillary and bringing these dissolved nutrients into contact with the tissue cells d. ultrafiltration and reabsorption e. bulk flow
A person develops anti-A antibodies only after he is exposed to antigen A, and anti-B antibodies only after he is exposed to antigen B.
Answer the following statement true (T) or false (F)