The effect that a neurotransmitter has on the postsynaptic membrane depends on the
A) frequency of neurotransmitter release.
B) nature of the neurotransmitter.
C) characteristics of the receptors.
D) quantity of neurotransmitters released.
E) All of the answers are correct.
E
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The cytoplasm of most animals is dominated by the same ions. Which of the following is NOT one of those ions?
A) K+ B) Cl- C) Na+ D) SO4-
The most important factor in decreasing the intracellular concentration of calcium ion after contraction is
A) Active transport of calcium across the sarcolemma. B) Active transport of calcium into the sarcoplasmic reticulum. C) Active transport of calcium into the synaptic cleft. D) Diffusion of calcium out of the cell. E) Diffusion of calcium into the sarcoplasmic reticulum.
The S-T segment of an ECG represents ________.
A. ventricular depolarization B. passage of the electrical impulse to the atrioventricular node C. atrial depolarization D. the plateau phase of the myocardial action potential
When do the testes start secreting testosterone?
A. In the first trimester after birth B. In the first three years of adolescence C. After the first ejaculation D. In the first trimester of fetal development E. In the first three years after birth