The lipid that stabilizes the membrane at extreme temperatures and is found in the hydrophobic regions of the bilayer is
A. the nonpolar tails.
B. glycocalyx.
C. glycolipid.
D. the polar head.
E. cholesterol.
Answer: E
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Norepinephrine is considered a positive chronotropic agent because it causes
A. less calcium to enter heart cells, which leads to lower risk of heart attack. B. more forceful contractions during each heart rate. C. an increase in the firing rate of SA node cells. D. thyroid hormone to have a steadying effect on heart activity. E. heart cell membrane potentials to become more positive during action potentials.
Parathyroid hormone is released when blood calcium levels decrease. This is an example of control by ________ stimuli.
A. humoral B. neural C. visceral D. hormonal
The loss of heat energy by vaporizing water is called
A) radiation. B) conduction. C) convection. D) evaporation. E) transmission.
The sacrum is a single bone consisting of the fused components of ________ sacral vertebrae
A) 1-3; it can vary B) 2 C) 3 D) 5 E) 4-6; it can vary