Which of the following is true regarding normal cardiac muscle?
A) Neither summation nor tetany can occur.
B) Both summation and tetany can occur.
C) Summation, but not tetany, can occur.
D) Tetany, but not summation, can occur.
E) Tetany always follows summation.
A) Neither summation nor tetany can occur.
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Which of the following is most likely to cause anemia?
A. Renal disease B. High altitude C. Air pollution other than by carbon monoxide D. Any factor that creates a state of hypoxemia E. Smoking
An inhibitory postsynaptic potential (IPSP) is associated with ________.
A) a change in sodium ion permeability B) hyperpolarization C) opening of voltage-regulated channels D) lowering the threshold for an action potential to occur
Which of the following is NOT a major opening into the right atrium?
A. pulmonary vein B. inferior vena cava C. superior vena cava D. coronary sinus
The most common blood type is
A) type A. B) type B. C) type AB. D) type O. E) type AO.