GP and AP Worksheet (EXAM 3 REVIEW)

Put the events of an action potential in order: Repolarization, Possible hyperpolarization, Threshold, Depolarization

1. Threshold

2. Depolarization

3. Repolarization

4. Possible hyperpolarization

Is Autonomic Nervous System part of the central or peripheral nervous system?

Peripheral nervous system

Is the Brain part of the central or the peripheral nervous system?

central nervous system

Is the enteric nervous system part of the central or peripheral nervous system?

peripheral nervous system

Is the spinal cord part of the central or peripheral nervous system?

central nervous system

Is the Somatic Nervous system part of the central or peripheral nervous system?

Peripheral nervous system

Is the Ganglion part of the central or peripheral nervous system?

peripheral nervous system

Is the nucleus part of the central or peripheral nervous system?

central nervous system

Where does the graded potential occur?

the dendrite

Where does the action potential occur at?

the axon

Where does the release of neurotransmitter occur at?

the synaptic end bulb

What type of channel mediates the graded potential?

Ligand gated channels

What type of channel mediates the action potential?

Voltage gated NA+ channels and Voltage gated K+ channels

What type of channel mediates the release of neurotransmitter?

Voltage gated Ca+ channels

What type of channel mediates the resting membrane potential?

Leakage channels

What is the order of the events involved in generating an action potential in the way they occur?

1. the neuron reaches threshold

2. Na+ activation gates open

3. Na+ enters cell and voltage becomes less negative

4. Na+ inactivation gates close and K+ channels open

5. K+ moves out of the cell

6. Excess K+ leaves cell causing hyperpolarization

7. K+ channels close

8. Leakage channels restore resting membrane potential

phagocytic glial cells found in CNS

microglia

found lining ventricles of bran; make CSF (cerebrospinal fluid)

ependymal cell

found only in peripheral nervous system; support neuron cell bodies in ganglia

satellite cell

form blood-brain barrier by covering blood capillaries, metabolize neurotransmitters, regulate K+ balance, and provide structural support

astrocyte

Most common glial cell type. Each forms myelin sheath around more than one axons in CNS

oligodendrocyte

Cells encircling PNS axons. Each cell produces part of the myelin sheath surrounding an axon in the PNS

Schwann cell