Atoms that are of the same element but contain different numbers of neutrons are called
A) isomers.
B) cations.
C) isotopes.
D) anions.
E) None of these is correct.
C) isotopes.
You might also like to view...
Which of the following is not part of the conduction system of the heart?
A) AV node B) bundle of His C) AV valve D) SA node
Beta receptors
A) are especially sensitive to epinephrine and relatively unresponsive to norepinephrine. B) may produce inhibition only. C) cause constriction of blood vessels in skeletal muscles. D) respond by opening ion channels that hyperpolarize the plasmalemma in heart muscle cells. E) may produce excitation only.
Kupffer cells is a special name given to:
a. neutrophils in the liver b. lymphocytes in the liver c. macrophages in the liver d. none of the above
Atrial contraction occurs shortly ______.
A. before P wave B. after P wave C. before T wave D. after T wave