Unit 5 Equilibrium Chemical messages

Question 1

presynaptic cell
vs
postsynaptic cell

Answer 1

presynaptic cell: sends message from terminal branches
vs
postsynaptic cell: receives message from dendrte

Question 2

Resting potiental

Answer 2

cell membrane -70mV
no activity
-negative inside cuz large molecules and Na + K pumps closed
-negative inside = polarized

Question 3

Action poteintal

Answer 3

cell membrane above +40mV
positive charge flows over negative axon
middle then depolarized as the Na pumps open

Question 4

depolarized

Answer 4

cell membrane +40mV way above threshold

the Na pumps then close agien

K pumps open to re-polarize

Question 5

re-polarize

refractery period

Answer 5

cell membrane -70mV

K pumps close

its ready for another action poriental

refractery period: time it takes to repolarize 1-10ms

Question 6

hyperpolarization

Answer 6

cell membrane -90mV

Question 7

Threshold potiental

Answer 7

-50 to-55,V