10-Explain on a drawing how the Action Potential crosses a synapse onto another
ID: 3476262 • Letter: 1
Question
10-Explain on a drawing how the Action Potential crosses a synapse onto another neuron. (3 pts) 7-Explain in your own words how Na and K start, continue, and reset the Action Potential along a neuron. (3 pts)( I answer this already) 11-Based on your answers to #7 and #10, why is the nerve impulse considered to be an electrochemical event? (1 pt) List two ways anesthesia can block the AP from crossing a synapse. (2 pts) a. b. List two ways a drug can overstimulate a synapse in the brain. (2 pts) a. b. What are the two main neurotransmitters in the PNS? (2 pts) What are two “feel good” neurotransmitters in the CNS? (2 pts) What kind of sodium gate is responsible for propagating APs? (1 pt) What kind of sodium gate is responsible for continuing the AP on the postsynaptic membrane? (1 pt) What is the main inhibitory neurotransmitter? (1 pt) List 3 reasons we need inhibitory neurotransmitters? (3 pts) a. b.
Explanation / Answer
1. A SYNAPSE is a place in between PRESYNATIC NEURON and POST SYNAPTIC NEURON. PRESYNATIC NEURON releases a neurotransmitter such as ACETYLCHOLINE into SYNAPTIC CLEFT. This neurotransmitter binds to its receptors on POSTSYNAPTIC NEURON . this leads to the opening of voltage gated channels hence propagation of action potential.
2. There are numerous ATP dependent Na/ K channels along the AXON especially at the AXON hillock. This leads to generation of action potential which later propagates along AXON by SALTATORY CINDUCTION at the RANVIERS NODES.
3. It is an electrochemical gradient because a neurotransmitter ( which is a chemical) alters the permeability of voltage gated channels leading to action potential ( which is an electrical event).
4. Anaesthesia may cause PRESYNATIC INHIBITION or POSTSYNAPTIC INHIBITION. In the first type it inhibits the release of neurotransmitter and in the second type it causes influx of potassium causing HYPERPOLARIZATION
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