the human nervous system

Question 1

define nervous system

Answer 1

an organ system made up of nerves and neurones that transmit electrical signals around the body

Question 2

define homeostasis

Answer 2

the maintenance of a constant internal environment in order to maintain optimum conditions for enzyme and cellular function

Question 3

explain why homeostasis is important

Answer 3

maintains enzyme activity and cell function

Question 4

give conditions that need to be controlled in the human body

Answer 4

blood glucose concentration, temperature and water levels

Question 5

define stimulus

Answer 5

a change in the environment

Question 6

define receptors

Answer 6

cells that detect stimuli

Question 7

define coordination centre

Answer 7

areas that obtain and process information from the receptors

Question 8

define effector

Answer 8

muscles or glands that respond to stimuli

Question 9

define neurone

Answer 9

a specialised cell adapted to carry electrical impulses around the body

Question 10

give 3 type of neurones

Answer 10

sensory, relay and motor

Question 11

describe the role of a sensory neurone

Answer 11

carried impulses from receptors to the coordination centre

Question 12

describe the role of the relay neurone

Answer 12

carries impulse across the CNS

Question 13

describe the role of a motor neurone

Answer 13

carries impulses from the coordination. centre to effectors

Question 14

define reflexes

Answer 14

rapid, automatic responses

Question 15

explain why reflexes are so important

Answer 15

they keep us safe

Question 16

why are reflexes so fast

Answer 16

they do not involve the conscious part of the brain as they pass through relay neurones found in the spine