Severe burns of the skin can result in life-threatening circulatory disturbances
Indicate whether the statement is true or false
T
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The action potential in a cardiac contractile cell causes
A) activation of sodium-potassium ATPase. B) opening of ryanodine receptor calcium channels. C) opening of L-type calcium channels. D) opening of HCN channels. E) activation of NCX transporters.
The medullary sinus of a lymph node contains ________ lymphocytes and plasma cells
A) cytotoxic T B) immature T C) NK D) B E) helper T
According to the Frank-Starling law of the heart,
a. shortening cardiac muscle fibers prior to contraction causes more forceful contractions b. increasing venous return increases EDV, which leads to an increased stroke volume c. as cardiac output decreases, blood pools in the vasculature and increases arterial blood pressure d. the left ventricle must pump more blood than the right ventricle since the left ventricle must pump blood to more regions of the body e. the greater the stroke volume, the smaller the subsequent ESV, because as more blood is squeezed out, the heart cannot fill as completely.
Too much acetylcholinesterase causes
A. voltage-gated Ca2+ channels opening in the presynaptic terminal. B. rapid degradation of acetylcholine. C. an increase in Na+ uptake by the muscle fiber. D. continuous stimulation of the muscle fiber. E. exocytosis of synaptic vesicles.