Cardiac muscle cannot undergo tetanus because its absolute refractory period lasts almost as long as the muscle twitch
Indicate whether the statement is true or false.
TRUE
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Genetics is the study of
A) inheritance of characteristics. B) the effect of the environment on health. C) sperm and eggs. D) DNA.
Skin temperatures may fluctuate between ___°F and ____ °F without damage
a. 40-98.6 b. 68-104 c. 0-98.6 d. 0-110 e. none of the above
High endothelial venules in a lymphoid organ function to:
a. Allow the entry of splenic platelets into the bloodstream b. Attract interstitial macrophages to degenerating red blood cells, as in the spleen c. Enable the exit of lymphocytes from the bloodstream into the tissue parenchyma d. Establish a barrier between the bloodstream and the tissue parenchyma, as in the thymus e. Provide a copious flow of fluid that becomes lymph
Which of the following enzymes is important for the metabolism of catecholamines?
A. Trypsin B. Tyrosine hydroxylase C. Superoxide dismutase D. Acetylcholinesterase E. Adenylyl cyclase