BIOLOGY 232 - Comparison between action potentials and synaptic

2.Comparison between action potentials and synaptic potentials:

Function Action Potential Graded Potential

Depolarization/

Hyperpolarization

Magnitude

2. Specify which ion, if there is more of it inside or surrounding neurons.

intracellular Extracellular

Sodium

Potassium

Chloride

3. . List all the areas on the neuron and the type of potential dependent on the following types of ion channels:

Channel Areas of neuron Type of potential

Leak

Ligand gated

Voltage gated

4.What will happen to the resting membrane potential of an excitable cell if: ( indicate which way the membrane potential would change.)

a. ­ extracellular fluid concentration of K⁺ ___________

b. ¯ extracellular fluid concentration of K⁺ ___________

c. ­ extracellular fluid concentration of Na⁺ ___________

d. ¯ number of passive Na⁺ channels ___________

e. open voltage-gated K⁺ channels ___________

f. open voltage-gated Na⁺ channels ___________

5.Whicch are the characteristics of voltage-gated sodium channels.

______ Always open

______ Found along the axon

______ Important for action potential

______ Opened and closed by gates

______ Found on the dendrites and cell bodies

______ Important for resting membrane potential