The use of vasodilators in treating heart disease is believed to
a. increase preload
b. decrease preload.
c. increase afterload.
d. decrease afterload.
.D
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The ________ is shared by the two ventricles
A) vena cava B) bicuspid valve C) chordae tendineae D) interventricular septum E) trabeculae carneae
How do peripheral proteins contribute to the structure of the plasmalemma?
A) Some may function as catalysts or receptor sites to signal through the plasmalemma. B) Some form channels to permit passage of water molecules, ions, and small water-soluble compounds into and out of the cell. C) They form a structural element by being embedded in the plasmalemma. D) They are attached to only one side of the membrane. E) None of the answers are correct.
In the autorhythmic SA node cells, the opening of the calcium channels allow
a) the further depolarization of these pacemaker cells b) the further repolarization of these pacemaker cells c) ventricular relaxation d) cardiac tamponade e) none of the above
The blood-brain barrier
A. does not prevent fluctuations in the composition of the blood from affecting the functions of the brain. B. prohibits the removal of waste materials from the neurons. C. protects neurons from toxic substances in the blood. D. prohibits the transport of amino acids and glucose to the neurons. E. permits passage of foreign substances from the blood to the neurons.