Key concepts: Synpatic physiology

Question 1

conditions

Answer 1

epilepsy
dementia

Question 2

action potenital definition

Answer 2

momentary reversal of membrane potential

Question 3

resting membrane potenital

Answer 3

-70mV

Question 4

depolarisation

Answer 4

neurotransmitters bind to the receptors on the dendrites
can cause depolarisation
make the membrane less polarised and closer to 0

Question 5

repeated depolarisation

Answer 5

threshold potential reached
-55mV
action potenital will occur

Question 6

what occurs at the threshold potenital

Answer 6

large number of voltage gated sodium channels will open
causing an influx of Na+ into the cell
causing massive depolarisation
membrane potential becomes positive and action potenital travels down the neuron

Question 7

what occurs at the peak of an action potenital

Answer 7

Na+ channels close
K+ channes open
allowing K+ efflux

Question 8

depolarisation

Answer 8

loss of K+
membrane potential becomes more negative

Question 9

hyperpolaristion

Answer 9

temporary overshoot past the resting membrane potential
enters the refractory period

Question 10

how is the resting potential restored

Answer 10

sodium potassium pump