Transmission within neurons

Question 1

name the three parts of a neuron and their functions

Answer 1

soma - contains nucleus
dendrites - recieves messaged
axon - carries action potential from some to terminal buttons

Question 2

which part of the neuron recieves info

Answer 2

dendrites

Question 3

afferent definition

Answer 3

bring info to a structure - arrives

Question 4

efferent definition

Answer 4

carries info from a structure - exit

Question 5

what are the three types of glia supporting cells

Answer 5

astrocytes, oligodendrocytes, microglia

Question 6

which glial cell produces the myelin sheath

Answer 6

oligodendrocytes

Question 7

what is the naked part of the axon called?

Answer 7

node of ranvier

Question 8

are neurons more -ive or more +ive on the inside

Answer 8

more -ive

Question 9

what two processes is the membrane potential balanced by?

Answer 9

diffusion, electrostatic pressure - attraction repulsion of particles depending on charge

Question 10

what are ions and what are the two types and their charge

Answer 10

charged molecules - cations +ive

anions -ive

Question 11

what ions do intercellular fluid contain

Answer 11

potassium ions k+

Question 12

what ions does extracellular fluid contain

Answer 12

sodium Na+ and chloride Cl-

Question 13

what is the resting potential for a neuron

Answer 13

-70mV

Question 14

where are K Cl and Na at resting potential

Answer 14

K+ inside
Cl- outside
Na+ outside

Question 15

what is done by the sodium potassium pumps to maintain resting potential

Answer 15

sodium pumped out, potassium pumped in

Question 16

what is depolarisation

Answer 16

increase from normal resting potential - brings membrane closer to 0

Question 17

what is hyperpolarisation

Answer 17

increase relative to resting potential - more negative

Question 18

what is it called when action potentials jump

Answer 18

saltatory conduction