The valve which prevents blood from returning to the right ventricle is the ___ valve.
a) aortic semilunar
b) bicuspid
c) tricuspid
d) pulmonary semilunar
Answer: d) pulmonary semilunar
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After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
A) calcium ions returning to the terminal cisternae B) the tropomyosin blocking the myosin once full contraction is achieved C) acetylcholinesterase destroying the ACh D) the action potential stops going down the overloaded T tubules
The effects of a neurotransmitter on the postsynaptic membrane include which of the following?
A) The neurotransmitter floats around in the synaptic cleft. B) Upon stimulation, the membrane releases more neurotransmitter molecules. C) Excitatory or inhibitory responses. D) Neurotransmitter molecules are absorbed by the postsynaptic cell. E) None of the answers are correct.
A glucose molecule is broken down into two pyruvic acid molecules in
A) gluconeogenesis. B) the electron transport system. C) glycolysis. D) the citric acid cycle.
Which of the following is NOT a division of the autonomic nervous system?
A. Somatic nervous system B. Sympathetic nervous system C. Parasympathetic nervous system D. None of the above