B10 the human nervous system

Question 1

define homeostasis

Answer 1

the regulation of the internal conditions of a cell or organism to maintain optimum conditions for functioning in response to internal and external changes

Question 2

name some examples on internal conditions to be controlled

Answer 2

body temp
water content of body
blood glucose concentration

Question 3

name the 3 main features of the control system

Answer 3

receptors
coordination centres
effectors

Question 4

describe role of receptors

Answer 4

cells that detect changes in external and internal environment.
these changes are known as stimuli
receptors may be part of nervous/hormonal control systems

Question 5

describe role of coordination centres

Answer 5

they receive and process the information from receptors and send out signals to coordinate a response

Question 6

name 3 examples of coordination systems

Answer 6

pancreas
spinal cord
brain

Question 7

describe the role of effectors

Answer 7

they re muscles/glands
they bring about responses to the stimulus received
their responses restore conditions in the body to the optimum levels

Question 8

what are reflexes for?

Answer 8

reflex actions are automatic and rapid and do not involve the conscious part of the brain
avoid danger or harm
breathing
moving food through digestive system