During one cardiac cycle the ventricles spend most of their time in
A) diastole.
B) contraction.
C) fibrillation.
D) systole.
E) None of the answers are correct.
A) diastole.
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What structures actually produce sound?
A. Vocal folds B. Vestibular folds C. Paranasal sinuses D. Vestibular ligaments E. Arytenoid cartilages
The function of the biceps femoris is to
A. flex the hip and ankle. B. extend the thigh and flex the leg. C. flex the thigh and extend the leg. D. flex the thigh (with no action at the leg). E. adduct the thigh and extend the knee.
List the following in the correct order of their occurrence within the ST segment on the ECG: ventricular ejection begins, lub sound, opening of semilunar valves, period of isovolumetric contraction, closing of AV valves, ventricular systole begins
What will be an ideal response?
A postsynaptic neuron has three presynaptic inputs - from neurons X, Y, and Z. When X and Y are stimulated simultaneously and repeatedly, the postsynaptic neuron reaches threshold and undergoes an action potential
When X and Z are stimulated simultaneously, however, there is no change in the membrane potential of the postsynaptic neuron. The simultaneous stimulation of X and Y is an example of A. temporal summation. B. presynaptic inhibition. C. spatial summation. D. neuronal divergence. E. presynaptic facilitation.