Which of the following is not part of the digestive tract?
a. small intestine
b. gall bladder
c. esophagus
d. spleen
e. exocrine pancreas
D
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Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors. Why?
A) The effectors are less sensitive to epinephrine and norepinephrine released by the adrenal glands. B) The hormones released from the adrenal glands bind to different receptors than those released from neurons. C) The adrenal gland releases larger amounts of the neurotransmitters than the neurons. D) There are no enzymes to break down epinephrine and norepinephrine in the blood and very little in peripheral tissues. E) The epinephrine and norepinephrine from the adrenal glands are released by sympathetic neurons, whereas parasympathetic neurons release these substances at the effector organs.
Important organic osmolytes in marine osmoconformers are
a. polyols and sugars. b. glycine and taurine. c. methylamine and methylsulfonium. d. urea. e. all of these.
Severing the sensory fibers from the lungs would result in all of the following except
A) less inhibition of the inspiratory center during forced breathing. B) a drop in tidal volume. C) potential damage to the lungs due to overinflation. D) a disappearance of the Hering-Breuer reflexes. E) less stimulation of the expiratory center during forced breathing.
On average, 1 microliter of blood contains __________ erythrocytes.
a. 260 million b. 25 million c. 10^13 d. 5.2 million