Nerve impulses are transmitted only along exposed portions of an axon
Indicate whether this statement is true or false.
TRUE
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The ion necessary to initiate the release of acetylcholine into the synaptic cleft is
A) calcium. B) chloride. C) sodium. D) potassium. E) zinc.
About how much of the oxygen content of arterial blood consists of oxygen molecules in solution?
A) 50% B) 25% C) 10% D) 5% E) 1.5%
The frequency of action potentials is ______
A) the reciprocal of the interspike interval B) measured in hertz C) measured in hertz and the same as the relative refractory period D) the reciprocal of the interspike interval and measured in hertz E) the same as the relative refractory period
Which of the following leukocytes is most likely to be found destroying viruses by phagocytosis?
A) lymphocytes B) monocytes C) basophils D) eosinophils