Senses

Question 1

Answer 1

Question 2

Name the senses

Answer 2

• Mechanoreceptors →movement, hearing and balance
• Chemoreceptors → chemicals (taste and smell)
• Thermoreceptors → temperature (hot and cold)
• Baroreceptors → pressure (touch)
• Photoreceptors → light (sight)

Question 3

CNS and PNS

Answer 3

• CNS → processes, interprets, stores info and issues orders to muscles, glands and organs
• PNS → transmits info to and from the CNS

Question 4

Answer 4

Question 5

Sclera

Answer 5

Tough outer layer of tissue which protects the eye

Question 6

Chloroid

Answer 6

Non-reflective layer, stops light reflecting around the eye

Question 7

Retina

Answer 7

• Sensitive to light
• Contains millions of rods and cones

Question 8

Cornea

Answer 8

Clear, tough layer on the front of the eye

Question 9

Pupil

Answer 9

Allows light into the eye

Question 10

Iris

Answer 10

Coloured, controls size of the pupil

Question 11

Lens

Answer 11

Flexible, focuses light onto retina

Question 12

Ciliary body

Answer 12

Controls shape of the lens

Question 13

Suspensory ligament

Answer 13

Connects ciliary body to the lens

Question 14

Aqueous humour

Answer 14

Maintains shape of cornea

Question 15

Vitreous humour

Answer 15

Maintains shape of the eye

Question 16

Blind spot

Answer 16

Where the nerves in the retina meet the optic nerve

Question 17

Optic nerve

Answer 17

Sends nerve pulses from retina to brain

Question 18

Answer 18

Question 19

How do we hear?

Answer 19

• Sound vibrates the ear drum
• Ear drum moves the malleus → incus → stapes
• Oval window → cochlea (P-E-P)
• Sensory hairs → audiotory nerve

Question 20

How does the ear help us balance?

Answer 20

• 3 semi-circular canals sense the movement of the body
• Each semi-circular canal → contains a fluid which moves as we turn

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