the nervous system

Question 1

what are the three types of neurons

Answer 1

1. sensory neurons
2. motor neurons
3. inter neurons

Question 2

what is the function of the sensory neuron

Answer 2

transmits impulse from sensory organs to the CNS

Question 3

what is the function of motor neurons

Answer 3

sends impulses from the CNS to specific muscles/ organs

Question 4

what is the function of interneurons

Answer 4

transmit impulses between sensory and motor neurons within brain or spinal cord

Question 5

the CNS is surrounded by a shock absorbing fluid called _______ ______ (CSF)

Answer 5

cerebrospinal fluid

Question 6

what is the advantage of keeping the circulating blood separate from the brain and spinal cord tissues

Answer 6

it gives the brain and spinal cord some protection from changes to blood composition, toxins and pathogens

Question 7

step one in responding to a stimulus

Answer 7

receptors detect a stimulus

Question 8

step two in responding to a stimulus

Answer 8

the impulse is sent along the sensory neuron to the spinal cord

Question 9

step three in responding to a stimulus

Answer 9

the CNS integrates the information and, if necessary sends it to the brain for processing

Question 10

step 4 in responding to a stimulus

Answer 10

impulse is sent from the CNS along the motor neurons to the effector

Question 11

step 5 in responding to a stimulus

Answer 11

the effector generates the response

Question 12

the sympathetic nervous system-

Answer 12

prepares the body for flight flight fright and sex

Question 13

the parasympathetic nervous system-

Answer 13

prepares the body for rest and calms it down

Question 14

parts of the body that detect stimuli and change as a result of the stimuli

Answer 14

receptors

Question 15

the type of receptor that detects the presence of chemicals

Answer 15

chemoreceptors

Question 16

the type of receptor that detects changes in temperature

Answer 16

thermoreceptors

Question 17

the type of receptor that detects mechanical changes in the environment

Answer 17

mechanoreceptors

Question 18

the type of receptor that detects the presence of light

Answer 18

photoreceptors

Question 19

the fold of skin that covers the eye to clean and protect it

Answer 19

eyelid

Question 20

the transparent covering on the eye that protects it and help to converge light rays that enter the eye

Answer 20

cornea

Question 21

the white part of the eye that is made of collagen that provides protections dan support

Answer 21

sclera

Question 22

the layer of light sensitive cells at the back of the eye that detect rays that are focused by the cornea and lens

Answer 22

retina

Question 23

the layer of blood vessels with a black pigment that nourishes the eye and absorbes light

Answer 23

choroid

Question 24

the ring of muscles that is coloured. it controls the amount of light entering the eye

Answer 24

iris

Question 25

the hole in the middle of the iris that allows light to enter the eye

Answer 25

pupil

Question 26

the hole in the middle of the iris that allows light to enter the eye

Answer 26

pupil

Question 27

the structure in the eye that is transparent and can change shape that focuses light onto retina and focus objects

Answer 27

lens

Question 28

the structure in the eye that is attached to the underside of the lens and produces aqueous humour and helps focus by altering shape of lens

Answer 28

ciliary body

Question 29

the structure in the eye that is located behind the lens that give the eyeball its shape

Answer 29

vitereous

Question 30

the structure in the eye that is found behind the cornea and provides nutrients to the cornea and lens

Answer 30

aqueous humour

Question 31

the structure in the eye that is found in the lateral side of the eye and helps orientate the pupil away from the centre of the body

Answer 31

lateral rectus muscles

Question 32

the structure in the eye that is found on the medial side of the eye which orientates the pupil towards the centre of the body

Answer 32

medial rectus muscle

Question 33

the spot located in the macula which has a high density of cone cells. gives sharp central vision and is where light is focused into

Answer 33

fovea

Question 34

the blind spot where there are no photoreceptors where the optic nerve leaves the eye

Answer 34

optic disk

Question 35

the bundle of fibres that relay information from the retina and fovea to the brain

Answer 35

optic nerve

Question 36

the photoreceptor of the retina that is sensitive to light and can function in dim light/darkness

Answer 36

rods

Question 37

the photoreceptor of the retina that work best in higher light intensity and allow some species to see in colour

Answer 37

cones