Biology 30 - Unit 1 Booklet 2: The Senses (Questions)

Why do neurons stop firing when sensory adaptation happens?

Threshold level for stimulus has moved up

What are the three regions of the ear?

Outer, middle, inner

1

Pinna

2

Auditory canal

3

Tympanic membrane

4

Ossicles

5

Semicircular canals

6

Auditory nerve

7

Cochlea

8

Eustachian tube

9

Vestibule

Which parts is the outer ear composed of?

Pinna, auditory canal

Which parts is the middle ear composed of?

Tympanic membrane, ossicles, oval window, eustachian tube

Which parts is the inner ear composed of?

Semicircular canals, vestibule, cochlea

What are the 2 sacs in the vestibule?

Utricle and saccule

What is the evolutionary purpose of taste receptors?

The differentiation of things that are edible and things that are not

What is the main difference between the function of taste receptors and smell receptors?

Taste detects dissolves chemicals from food, smell detects airborne chemicals

What is the advantage and drawback of vision at the fovea centralis?

At the focal point, you can see the most clearly, but peripheral vision is less

What is part of the outermost layer of the eye?

Sclera, cornea, aqueous humour

What is part of the middle layer of the eye?

Choroid layer, iris, lens, ciliary muscles, vitreous humour

What is part of the inner layer of the eye?

Retina, rods, cones, fovea centralis

1

Vitreous Humour

2

Cornea

3

Lens

4

Pupil

5

Aqueous Humour

6

Iris

7

Ciliary muscles

8

Retina

9

Choroid layer

10

Fovea centralis

11

Optic nerve

12

Blind spot

13

Sclera

How is myopia corrected?

Using a concave lens

How is hyperopia corrected?

Using a convex lens

How does light information get transferred to the brain?

Light enters the cornea and is bent towards the pupil. The iris allows light to enter the pupil, where the lens focuses the image onto the retina, transmitted by the vitreous humour. The captured and focus light is turned into an action potential that is carried along the optic nerve to the occipital lobe

How does auditory information get transferred to the brain?

A sound wave is funnelled into the auditory canal by the pinna, which funnels sound to the tympanic membrane. The sound vibrates the tympanic membrane, and the vibration is amplified by the ossicles and passed to the oval window where it is further amplified. Hair cells in the Organ of Corti of the cochlea turn these vibrations into action potentials that are carried along the auditory nerve to the temporal lobe