Which of the following statements about the absolute refractory period of cardiac muscle cells is TRUE?
A. It lasts for the same length of time in cardiac muscle cells as it does in skeletal muscle cells.
B. It is much longer than the refractory period of skeletal muscle cells.
C. It allows for tetanic contractions of the heart to occur to assure smooth, coordinated ejection of blood from the ventricles.
D. Ventricular muscle cells are in the absolute refractory period from the beginning of contraction until the beginning of their next contraction.
E. During the absolute refractory period, a larger-than-normal stimulus will result in a premature ventricular contraction.
B
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Fill in the blank(s) with the appropriate word(s).
The eye structure that transmits and refracts incoming light is the
A. ciliary body. B. conjunctiva. C. cornea. D. pupil. E. iris.
Which artery is vulnerable to injury because it runs superficially?
A. The subclavian artery B. The popliteal artery C. The femoral artery D. The brachial artery E. The radial artery
The difference between the net hydrostatic pressure and the net colloid osmotic pressure is the __________.
capsular hydrostatic pressure glomerular hydrostatic pressure net filtration pressure glomerular filtration rate