Nervous system 12.1/2

Question 1

Sensation

Answer 1

brains processing of impulse generated by sensory receptors

Question 2

4 types of sensory receptors and what they’re responsible for

Answer 2

1)photo receptors (vision)
2) chemo receptors (Taste and smell)
3) mechano receptors (Hearing, touch)
4) Thermal receptors (temperature)

Question 3

Vision is dependent on ____+____

Answer 3

Photo receptors in the eye to start the signal of an image and interpretation in the occipital lobe

Question 4

Eye is designed to send light on to the ___

Answer 4

Retina which contains rods and cones

Question 5

What 3 parts is the eye divided into

Answer 5

1)Sclera 2) Choroid 3) Retina

Question 6

Sclera

Answer 6

Tough white external layer that protects the inside of the eye and maintain eye shape

Question 7

Cornea

Answer 7

Transparent (no blood) part of Sclera that lets light into the eye and bends the rays (convex lenses)

Question 8

Choroid coat

Answer 8

middle layer with many blood vessels that nourishes other eye parts and absorbs scattered light rays preventing reflection

Question 9

Pupil

Answer 9

opening in then center of iris that lets light in

Question 10

Iris

Answer 10

Sphincter muscle that is part of the Choroid that adjusts the size of the pupil to control the amount of light entering

Question 11

lens

Answer 11

behind the iris, attached to the ciliary muscle. changes its shape to focus light onto the retina

Question 11

suspensory ligaments

Answer 11

attached to the lens and works to change the shape of the lens when dealing with far/near objects

Question 12

Aqueous humor

Answer 12

Watery fluid In front of the lens (anterior) that maintains eye shape and nourishes surrounding cells

Question 13

vitreous humor

Answer 13

jelly like fluid surrounding the inner chamber (posterior to lens)

Question 13

Rods

Answer 13

photo receptors that detect light intensity

Question 14

Retina

Answer 14

inner layer of eye containing photo receptors (rods +cones)

Question 15

cones

Answer 15

photo receptors that detect colors

Question 16

Forea centralis

Answer 16

pit in retina where cones are densely packed

Question 17

optic disk

Answer 17

part of the retina that join s the optic nerve and contains no photo receptors

Question 18

Optic nerve

Answer 18

leaves the eye at blind spot and carries impulses from rods/cones to the brain

Question 18

conjuctira

Answer 18

thin, transparent membrane that covers the inside of the eye and seals it from infection

Question 19

light rays bend when they encounter the ___+____+____

Answer 19

cornea, lends and humors

Question 19

seeing far away accommodations

Answer 19

ciliary muscles relax backwards- suspensory ligaments tighten- lens flattens

Question 20

Close up accomodations

Answer 20

ciliary muscles- contract forwards- suspensory ligaments loosen- lens rounds

Question 21

rods act to see in ____ light and are concentrated ____

Answer 21

dim/dark light
concentrated on the outside edges of retina

Question 22

cones are concentrated___

Answer 22

at the fovea centralis

Question 23

Cones can detect what 3 colours

Answer 23

red, blue and green but combine those 3 to stimulate other colours

Question 24

2 light absorbing pigments

Answer 24

1) rhodopsin (retinal and opsin)
2) photopsin

Question 24

in the dark rods release

Answer 24

an inhibitory neurotransmitter

Question 25

After light is absorbed…

Answer 25

rhodopsin- retinal and opsin- stops inhibitory neurotransmitter- nerve impulse

Question 26

impulse is condecuted and travels…

Answer 26

rods+cones- bipolar sensory neuron- ganglion cells- optic nerve- thalamus- occipital lobe