As soon as left ventricular pressure exceeds the pressure in the aorta, the
A. aortic semilunar valve opens.
B. atria pump blood into the ventricles.
C. ventricles pump blood into the atria.
D. pulmonary semilunar valve closes.
E. AV valves open.
Answer: A
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Which of these does not contribute to the cessation of the signal in a synaptic transmission?
A) Neurotransmitter escapes from the synapse into the nearby extracellular fluid. B) The synaptic knob reabsorbs some neurotransmitters by endocytosis. C) Synaptic vesicles secrete neurotransmitter by exocytosis. D) Neurotransmitters are no longer released. E) Enzymes in the postsynaptic cell break down some neurotransmitters.
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Which of the following statements related to the "ON pathway" of the visual system is correct?
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