Conduction of Action Potentials and Synapses How does an action potential get fr

Question

Conduction of Action Potentials and Synapses How does an action potential get from one cell to another?" Model 1: There are multiple types of ion channels in excitable cells. 1. Stimulus arrives at Stimulus 2. Stimulus-gated Na channel gated ion channel (sensory input opens and Na floods the or a neurotransmitter like Ach) inside of the cell voltage causes the voltage- gated Na channel to open (Stimulus) Stimulus) Voltage-gated Na channel Stimulus-gated Na channel 3. Influx of Na+ causes the voltage near the channel to rise Critical Thinking Questions According to the model, what are some examples of stimuli that can causea stimulus-gated Na channel to open? 1. 2. According to the model, what causes the voltage-gated Na channels to open? a. Small increases in potential will not cause these channels to open. What do you (the group) think is the term for the actual potential value that will cause these channels to open (the point of no return)?

Explanation / Answer

1.According to the given model the stimuli that causes stimulus - gated Na channels to open are Sensory inputs and neurotransmitters like acetylcholine (Ach), norepinephrine(NE), Dopamine(D), etc.

2.When the stimulus gated Na channels opens it allows the entry of large amounts of Na+ ions causing voltage to rise which further results in opening of voltage - gated Na channels.

a. Threshold potential.

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