Ch10 The human nervous system

Question 1

Homeostasis

Answer 1

Maintaining a stable environment inside the body and cells in response to internal and external conditions

Question 2

Internal conditions are controlled

Answer 2

body temperature
water content
blood glucose concentration

Question 3

receptors

Answer 3

cells that detect changes in internal or external environment(stimuli)

Question 4

coordination centres(CNS)

Answer 4

area that receive and process info from the receptors
send out signals and coordinate response of the body
e.g. brain, spinal cord and pancreas

Question 5

effectors

Answer 5

muscles or glands that produce a response to stimulus that has been received to restore optimum levels

Question 6

nervous system

Answer 6

stimuli
receptor
sensory neurone
CNS
motor neurone
effector
response

Question 7

reflexes

Answer 7

automatic and rapid responses to avoid damage or harm

Question 8

reflex arc

Answer 8

stimulus
receptor 
sensory neurone
relay neurone in spinal cord of unconscious part of the brain
motor neurone
effector
response

Question 9

synapses

Answer 9

physical gaps between neurones that electric impulses can’t leap across

Question 10

How synapses work

Answer 10

electrical impulses reach synapses
chemicals are released from sacs
chemicals(neurotransmitters) diffuse across
chemicals attach to the surface of the next neurone and create a new impulse