PSYCH 3320 EXAM 1 STUDY GUIDE
Soma - Answers-
cell body that contains nucleus
dendrites - Answers-
receives info from other neurons
axon - Answers-
, carries info away from neuron
action potential -
Answers-
1. resting membrane potential
2. excitatory potential depolarizes the membrane to threshold, sodium (Na+) channels
open
3. sodium enters the cell, depolarization occurs
4. sodium channels inactivated, potassium (K+) channels open
5. repolarization occurs as potassium flows out of the cell
6. sodium channels reset upon returning to the resting membrane potential by opening
of inactivation gate and closing of activation gate
7. potassium channels are too slow to close, resulting in hyperpolarization
8. potassium channels close by the closing of their activation gate and the resting
membrane potential is gradually restored
permeability - Answers- channels let certain chemicals pass and keep others out
neurotransmitter action steps - Answers- 1. molecules synthesized- influenced by
enzymes
2. molecules stored in vesicles
3. molecules that leak are destroyed
4. vesicles fuse with presynaptic membrane and release molecules into synapse
5. released molecules bind with autoreceptors
Soma - Answers-
cell body that contains nucleus
dendrites - Answers-
receives info from other neurons
axon - Answers-
, carries info away from neuron
action potential -
Answers-
1. resting membrane potential
2. excitatory potential depolarizes the membrane to threshold, sodium (Na+) channels
open
3. sodium enters the cell, depolarization occurs
4. sodium channels inactivated, potassium (K+) channels open
5. repolarization occurs as potassium flows out of the cell
6. sodium channels reset upon returning to the resting membrane potential by opening
of inactivation gate and closing of activation gate
7. potassium channels are too slow to close, resulting in hyperpolarization
8. potassium channels close by the closing of their activation gate and the resting
membrane potential is gradually restored
permeability - Answers- channels let certain chemicals pass and keep others out
neurotransmitter action steps - Answers- 1. molecules synthesized- influenced by
enzymes
2. molecules stored in vesicles
3. molecules that leak are destroyed
4. vesicles fuse with presynaptic membrane and release molecules into synapse
5. released molecules bind with autoreceptors
