Chapter 4

Question 1

Repolarization

Answer 1

return to resting potential after depolarization

Question 2

hyperpolarization

Answer 2

• increase in potential; membrane becomes more negative.
  -inhibits cell

Question 3

graded potentials

Answer 3

short-distance signals; different sizes of stimulus

Question 4

action potential

Answer 4

long distance signals

Question 5

absolutely refractory period

Answer 5

membrane cannot be more stimulated

Question 6

relative refractory period

Answer 6

membrane can only be re-stimulated by stronger stimulus

Question 7

In a chemical synapse is the 1st neuron called

Answer 7

presynaptic neuron.

They release the neurotransmitter that binds on the post synaptic neuron

Question 8

T or F: threshold potential is the peak potential achieved during the action potential

Answer 8

False.

It is where the Na+ and K+ channels are activated

Question 9

What is the peak of action potential measured at?

Answer 9

+30 MV

Question 10

What is the point where the voltage gated channels first open?

Answer 10

Peak of action potential

Question 11

What is an ESSP

Answer 11

a depolarizing potential

Question 12

The falling phase of the action potential is due to

Answer 12

potassium leaving the cell