biology homeostasis nervous

Question 1

Homestasis

Answer 1

maintaining balance in internal enviornment in organisms

Question 2

feedback mechanism

Answer 2

mechanisms used by homeostatsis to maintain conditions

Question 3

three ranges of conditions

Answer 3

temp
blood glucose
blood ph

Question 4

sensors

Answer 4

secialized cells that detects some aspects of of the conditions

Question 5

Control centre

Answer 5

receives info from sensors and coordinates a response (part of brain)

Question 6

Effectors

Answer 6

cells that respond to signal from control centre

Question 7

negative feed back system

Answer 7

body works to reverse a change to get body back to og state

Question 8

positive feed back system

Answer 8

increase a change to state of the body
less common

Question 9

neurons

Answer 9

basic nerve cells that are organized into tissues called nerves

Question 10

glial cells

Answer 10

support cells for neurons

Question 11

dendrites

Answer 11

short branches that recieve impulses from other neurons and relay to the cell body

Question 12

cell body

Answer 12

contains nucleus, is the sight of metabolic reactons
processes incoming impulses
if large enough, relays impulse to axon

Question 13

axon

Answer 13

long branch from body, that conducts nerve impulses away from cell body to other neurons and muscles
often surrounded by myelin sheath
protects axon and speeds up nerve impulse transmission

Question 14

myelin sheath

Answer 14

fatty insulation formed by schwann cells wrapped around axon

Question 15

multi polar

Answer 15

multiple dendrites
single axon
brain and spinal cord

Question 16

bi polar

Answer 16

one dendrite
one axon
ear, retina, olfactory

Question 17

uni polar

Answer 17

dendrite axon fused

Question 18

sensory neurons

Answer 18

recieve stimuli and transmit impulse to central nervous system

Question 19

interneurons

Answer 19

in central nervous system processing incoming signals and sends out signals

Question 20

motor neurons

Answer 20

transmits impulses from central nervous system to effectors
muscles, glands, organs

Question 21

reflex arc

Answer 21

neural circuit hat results in a response to a stimulus
no processing of info by central nervous system

Question 22

nerve impulse

Answer 22

method of electrical stimuation used by neurons to send signals

Question 23

synapses

Answer 23

connection between 2 neurons or a neuron and an effector

Question 24

neurotransmitter

Answer 24

transfers impulse to aanother cell when an action potenial reaches the end of an axon

Question 25

excitatory neurotransmiter

Answer 25

opens na channels
naflows into cytosol
membrane depolarizes

Question 26

inhibitory

Answer 26

open k channels
kflows out of cytosol
membrane hyperpolarizes

Question 27

central nervous system

Answer 27

spinal cord and brain
grey and white matter

Question 28

grey matter

Answer 28

unmyelinated neurons on outer side of brain and core of spinal cord

Question 29

white matter

Answer 29

myelinated neurons in middle of brain and outisde of spinal cord

Question 30

spinal cord

Answer 30

link between bain and peripheral nervous system

Question 31

meniges

Answer 31

3 layers of tough elastic tissue

Question 32

cerebrospinal fluid

Answer 32

circulates cns, acts as shock absorber and delivers nutrients and horomones
only around brain and spine

Question 33

Brian

Answer 33

hindbrain
midbrain
forebrain

Question 34

hindbrain

Answer 34

cerebellum, medulla oblongata, pons

Question 35

midbrain

Answer 35

processes sensory input

Question 36

forebrain

Answer 36

thalamus, hypothalamus, cerebrum