Neural Signaling

Resting membrane potential is usually near __________ mV

• -90mV

• -70mV

• +66mV

• +90mV

Extracellular fluid compostition:

• low levels of Na & Cl and negative charge

• high levels of Na & Cl and positive charge

• high levels of K & negative charge

• high levels of K & positive charge

Intracellular fluid compostition:

• high levels of Na & Cl and negative charge

• high levels of Na & Cl and positive charge

• high levels of K & negative charge

• high levels of K & positive charge

Sodium/Potassium pump

• 2 Na out for 3 K in

• 3 Na out for 2 K in

• 2 K out for 3 Na in

• 3 K out for 2 Na in

movement of charges to eliminate a potential difference

• Permeability

• Resistance

• Current

• Threshold

something that restricts movement of charges

• Permeability

• Resistance

• Current

• Threshold

level of voltage needed for gated channel to open

• Permeability

• Resistance

• Current

• Threshold

changes in membrane potential that cannot spread far from site of stimulation

• electrochemical gradient

• action potential

• graded potential

• resting membrane potential

NOT a step in graded potential

• Hyperpolarization

• Hypopolarization

• Depolarization

• Repolarization

How many action potential can propogate down a neuron per second?

• 1

• 10

• 100

• 1000