week 7

Question 1

Central nervous system

Answer 1

brain and spinal cord

integration and command centre

Question 2

Peripheral nervous system

Answer 2

spinal and cranial nerves

Question 3

sensory afferent division

Answer 3

somatic and visceral sensory nerve fibres

goes back to CNS

Question 4

Motor efferent

Answer 4

motor nerves

carry impulse away from CNS

Question 5

somatic nervous system

Answer 5

voluntary

CNS to skeletal muscles

Question 6

autonomic system

Answer 6

involuntary

CNS to cardiac, smooth muscles, & glands

Question 7

neurons

Answer 7

excitable cells
long-lived amitotic
body, axon, dendrites

Question 8

satellite cells + Schwann cells

Answer 8

surround neurons in PNS

Question 9

do Schwann cells form myelin

Answer 9

yes

Question 10

Astrocytes

Answer 10

most abundant in CNS

Question 11

microglial

Answer 11

defensive cells in CNS

Question 12

Ependymal

Answer 12

line cerebrospinal fluid-filled cavities

Question 13

oligodendrocytes

Answer 13

form myelin sheaths around CNS

Question 14

interneurons

Answer 14

connect between neurons in CNS

Question 15

what is the membrane potential range

Answer 15

-70 to +30 mV

Question 16

Action potential all or nothing

Answer 16

must reach a certain threshold potential to open voltage-gated Na+ channel

once -50mV is reached voltage-gated channels open

Question 17

synapse

Answer 17

site of communication between neurons

Question 18

first neuron sending signal is

Answer 18

presynaptic

Question 19

receiving neuron is

Answer 19

postsynaptic