Objective 4. Outline the steps of a nerve impulse, and its conduction from one neuron to the next. Action Potential. A nerve impulse, signal, electrical impulse… Is correctly called an “Action Potential” “Potential” is from the chemistry…the potential charges of the + and – ions involved
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Outline the steps of a nerve impulse, and its conduction from one neuron to the next.
3. Repolarizing – Na channels close. K+ channels open
4. “Undershoot” – K+ channels are open too long, there is a ‘dip’ in the charge
5. Sodium/Potassium Pump – energy is used to pump Na & K back to normal state
1. Ca+ Gates open when action potential (nerve impulse) reaches the axon terminal
2. Ca+ causes vesicles (vacuoles) to dump Neurotransmitters into the synapse (gap)
3. Neurotransmitters bind to the receptors of the next cell (can be another neuron, a muscle, or a gland)
4. Binding causes Na+ ion channels to open so …
- (if neuron) action potential can continue
- (if muscle/gland) trigger the appropriate response
List the main components of a reflex arc.