parts of a neuron and the brain CH 13 + 14

Question 1

dendrite

Answer 1

conducts nerve impulses towards cell body

Question 2

cell body

Answer 2

contains genetic info, maintians structure and gives energy to the cell

Question 3

axons

Answer 3

conducts nerve impulses towards other neurons or effectors

Question 4

myelin sheath

Answer 4

insulated covering over the axon of a nerve cell, prevents loss of charged ions from the nerve cell, produced by shwaan cell

Question 5

nodes of ranvier

Answer 5

bumps between sections on the axon, speeds up impulse carrage, prevents ion loss

Question 6

neurilemma

Answer 6

delicate membrane that surrounds axon of some nerve cells, formed by shwaan cells, used to regenerate damaged axons

Question 7

synapse

Answer 7

region between neurons

Question 8

acetyllcholine

Answer 8

released from vesticles in neuron end plates, and makes the postsynaptic membrane more permeable to salt

Question 9

cholinesterase

Answer 9

breaks down acetylcholine by removing it

Question 10

meninges

Answer 10

protective membranes surrounding brain and spinal chord

Question 11

foramen magnum

Answer 11

hole in skull for spinal chord

Question 12

cerebrum

Answer 12

located in the forebrain; major coordinating center for sensory info and accompanying motor actons originate (speech, reasoning, personality)

Question 13

outer layer of the cerebrum

Answer 13

cerebral cortex

Question 14

how do two sides of cerebrum communicate

Answer 14

corpus calosum

Question 15

frontal lobe

Answer 15

motor control of voluntary movments associated with intelectual activities and personality

Question 16

temporal

Answer 16

sensory areas associated with vision and hearing association areas are linked to memory and interpretation of sensory info

Question 17

parietal

Answer 17

sensory areas are associated with vision and hearing association areas are linked to emotions and interpreting speech

Question 18

occipital

Answer 18

sensory areas associated with vision association areas interpret visual info

Question 19

thalamus

Answer 19

directs incoming sensory info to the right parts of the cerebrum for interpretation

Question 20

olfactory bulbs

Answer 20

located at bottom of temporal lobes, receives and interprets info about smell

Question 21

midbrain

Answer 21

acts as a relay centre for some eye and ear reflexes

Question 22

hindbrain

Answer 22

cerebellum, pons, medulla oblongata

Question 23

cerebellum

Answer 23

contracts limb movments, balance and muscle tone

Question 24

pons

Answer 24

relay station, passes info between the 2 regions of the cerebellum and between the cerebellum and the medulla