Action potentials

Question 1

What does it mean when an action potential is all or nothing

Answer 1

it means that an signal is only sent if the signal is more than the threshold, and when the signal is not strong enough nothing happens

Question 2

Neuron is at rest what is happening

Answer 2

Na/K pumps activate Moves 3Na+ out for every 2K+ into the neuron.

Question 3

Neuron is depolarizing

Answer 3

Na+ gates/ Channels open and Na+ diffuses into the neuron

Question 4

Neuron is repolarizing/hyperpolarizing

Answer 4

NA+ gates close K+ gates open and K+ diffuses out of the neuron

Question 5

neuron returns to resting potential

Answer 5

K+ gates close. Na=/k+ pumps reactivate to bring membrane potential back to rest (-70)

Question 6

What are the 2 reasons why it is important that there is a refractory period?

Answer 6

Allows for the action potential to be uni directional

limits the rate at which signals are sent through a neuron

Question 7

Acetylcholine

Answer 7

Cns signaling and body actions

Question 8

Dopamine

Answer 8

Motivation to achieve and Gl functions

Question 9

Endorphines

Answer 9

Pain and stress relief and helps to improve mood

Question 10

Epinephirne

Answer 10

fight or flight aka adrenaline

Question 11

GABA

Answer 11

Mood and emotions reduces exitability

Question 12

Norephinhrine

Answer 12

Excites the body and increases functions such as the heart and energy metabolism

Question 13

Serotonin

Answer 13

helps regulate all the things associated with the brainstems functions

Question 14

what is reuptake

Answer 14

When extra neurotransmitters are broken down and reabsorbed by the axon terminal of the presynaptic neuron

Question 15

What effect might have on reuptake?

Answer 15

Some drugs Prevent reuptake leaving neurotransmitters out longer

Question 16

how will this affect the brain

Answer 16

increases stimulation of neurons, over time the neuron gets desensitized to the Neurotransmitter