Q1. In order for a neuron to move from the absolute to the relative refractory period,...

Q1. In order for a neuron to move from the absolute to the relative refractory period, a majority of that neuron's sodium channels must have their:

Select one:

a) inactivation gates open
b) activation gates closed
c) inactivation gates closed
d) activation gates open and inactivation gates closed

Q2. Which of the following is NOT true of graded potentials?

Select one:
a) They are produced after the binding of neurotransmitter to receptor
b) they will decrease in magnitude as the current flows away from the initial site
c) they are produced at chemically-gated ion channels
d) they are limited in duration by the refractory period of the membrane

Expert Solution

Ans1:-d) activation gates open and inactivation gates closed.

Relative refractory stage mainly occurs in Repolarization stage in which activation gates isopen and inactivation gates is closed.

Ans2:- d) they are limited in duration by the refractory period of the membrane

No refractory period is associated with graded potentials. ... Graded potentials are brought about by external stimuli (in sensory neurons) or by neurotransmitters released in synapses, where they cause graded potentials in the post-synaptic cell. Action potentials are triggered by membrane depolarization to threshold.

Graded Potentials. Graded potentials are temporary changes in the membrane voltage, the characteristics of which depend on the size of the stimulus. Some types of stimuli cause depolarization of the membrane, whereas others cause hyperpolarization.

they will decrease in magnitude as the current flows away from the initial site

they are produced at chemically-gated ion channels

Sydney Mullin answered 2 years ago

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