science chapter 7

Question 1

stimulus

Answer 1

a change or signal in the environment that an organism can recognize and react to

Question 2

response

Answer 2

a reaction to a stimulus

Question 3

neuron

Answer 3

cells that carry info through your nervous system

Question 4

nerve impulse

Answer 4

the message that a neurron carries

Question 5

dendrite

Answer 5

a branch like structure that picks up the impulses

Question 6

axon

Answer 6

a long structure leading away from the cell body

Question 7

nerve

Answer 7

a bundle of nerve fibers

Question 8

sensory neurons

Answer 8

picks up a stimulus and converts it into nerve impulse

Question 9

interneron

Answer 9

carries a nerve impulse to another interneuron or motor neuron

Question 10

motor neuron

Answer 10

sends an impulse to a muscle or gland enabling it to respond

Question 11

synapse

Answer 11

a place where a neuron transfers an impulse to another structure

Question 12

central nervous system(cns)

Answer 12

includes the brain and spinal cord and acts like the traffic cop and controls the functions of the body

Question 13

peripheral nervous system (PNS)

Answer 13

includes all the nerves outside of the CNS which are like the car drivers

Question 14

brain

Answer 14

the control center

Question 15

spinal cord

Answer 15

a thick column of nervous tissue

Question 16

cerebrum

Answer 16

interputs input from your senses,controls movement, and carries out complex mental processes such as learning and remembering

Question 17

cerebellum

Answer 17

coordinates your muscle actions and helps keep your balance

Question 18

brain stem

Answer 18

controls your body involuntary actions like your breathing plus heartbeat

Question 19

somatic nervous system

Answer 19

controls voluntary actions such as using a fork

Question 20

autonomic nervous system

Answer 20

controls involuntary actions such a as digesting food

Question 21

reflex

Answer 21

an automatic response that occurs repidly without conscious control

Question 22

concussion

Answer 22

occurs when the soft tissue of the brain is bruised as it collides against thee skull

Question 23

cornea

Answer 23

clear tissue that covers the front of the eye

Question 24

pupil

Answer 24

the opening through which light enters the eye

Question 25

iris

Answer 25

is circular structure that surrounds the pupil

Question 26

lens

Answer 26

a flexible structure that focuses light

Question 27

retina

Answer 27

lines the back of the eye and contains light-sensetive cells

Question 28

nearsightedness

Answer 28

see nearby objects clearly but not distant

Question 29

farsightedness

Answer 29

see distant objects nu not nearby

Question 30

eardrum

Answer 30

a membrain that vibrates when sound waves strike it

Question 31

cochlea

Answer 31

is a snail shaped tube lined with sound

Question 32

semicircular canal

Answer 32

help your CNS maintain balence

Question 33

taste buds

Answer 33

sensory receptors on your tongue that respond to chemicals form the cookie that dissolved in saliva

Question 34

drugs

Answer 34

any chemical taken into the body that causes changes in a persons body or behavior

Question 35

drug abuse

Answer 35

the use of a drug for nonmedical purposes or using illiegal drugs

Question 36

tolerance

Answer 36

a state in which a drug user needs more of a drug to produce the same effect of the body

Question 37

addiction

Answer 37

when the body becomes physically dependent on a drug

Question 38

withdraw

Answer 38

an adjustment when someone stops taking a drug on Which the body's is dependent

Question 39

depressants

Answer 39

drugs that slow down the central nervouse system

Question 40

stimulants

Answer 40

drugs that speed up the body process

Question 41

anabolic steroids

Answer 41

are synthetic chemicals produce in body like hormones

Question 42

alcoholism

Answer 42

a disease in which a persons is physically addicted to alcohol

Question 43

a change or signal in the environment that can make the nervouse system react is called a

Answer 43

stimulus