Negatively charged protein molecules are more prevalent within a neuron's cytosol than in the interstitial fluid.
Answer the following statement true (T) or false (F)
True
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During the relative refractory period, an initial threshold-level depolarization is usually not sufficient to trigger an action potential. Why?
A) Some Na+ channels have returned to their resting position and K+ channels are still open, so Na+ entry is offset by K+ loss. B) Only some Na+ channels have returned to their resting position. C) Only K+ channels are still open, so Na+ entry is offset by K+ loss. D) The statement is incorrect; a threshold-level depolarization always triggers an action potential. E) Only a few K+ channels have returned to their resting position.
Which of the following is the molecular motor that carries secretory vesicles to the ends of the axon?
a. kinesin b. dynein c. actin d. NAD e. microfilaments
All of the following local chemical factors will cause vasodilation of arterioles, except
a. decreased K+. b. increased CO2. c. increased acid. d. decreased O2. e. histamine release.
The adjustment of the thickness of the lens to make close vision possible is called ________.
Fill in the blank(s) with the appropriate word(s).