lec 2

Question 1

neuron anatomy and pathway for action potential?

Answer 1

dendrites receive impulses which are integrated around the axon pillic (bottom of the soma, top of the axon) in that if an axon potential is going to be generated its going to be generated here. So basically lots of excitatory input comes into the cell and if theres enough of it it results the pillic to reach a certain threshold which fires an action potential. This is transmitted down the axon to the and bunch more stuff happens

axons are myelinated by a myelin sheath with nodes of ranvier inbetween

Question 2

resting membrane potential

Answer 2

the inside of hte cell is negative relative to the outside of the cell. typically -70mv

if there is enough influx of positive charge (excitation) into the cell and the membrane potential increases to -60mv, an action potential will fire.

memorise graph of concentration gradients, Na+, Cl-, K+

but basically enough Na+ goes into the cell cuasing threshold to be reached and action potential to be transmitted

Question 3

pump?

Question 4

depolarised vs hyperpolarised?

Answer 4

depoplarised is when something becomes less negative aka more positive

hyperpolarised is when something becomes more negative aka less positive

Question 5

epsp? ipsp?

Answer 5

e is connected to na and i is connected to k+

Question 6

neural integration?

Answer 6

many excitatory inp[uts arrive at the same time pushing the potential to the threshold

Question 7

combinations of spatial summation?

Question 8

combinations of temporal summation?

Question 9

GRADED AND ALL OR NONE IN TERMS OF EPSP AND ACTION POTENTIAL?

Question 10

movement of ions during the action potentialz

Question 11

what does the myelin sheath on the axon potential do?