A&P: SENSES

Question 1

[sight: eyes]
Cornea

Answer 1

At the front of the eyeball, the transparent cornea allows light to enter the eye

Question 2

[sight: eyes]
Iris

Answer 2

-behind the cornea is the iris, which gives our eyes color
-changes in size, regulating how much light is allowed to enter the pupil

Question 3

[sight: eyes]
Pupil

Answer 3

Middle of iris

Question 4

[sight: eyes]
Lens

Answer 4

Focuses light onto the retina, its shape being changed by attached muscles

Question 5

[sight: eyes]
Retina

Answer 5

Intermost layer of the eyeball and contains two types of photo receptor cells: rod cells and cone cells

Question 6

[sight: eyes]
Retina: ROD CELLS

Answer 6

Sensitive to light, distinguish between black and white, and allow us to see at night

Question 7

[sight: eyes]
Retina CONE CELLS

Answer 7

-allow us to distinguish colors in the day
-when they are stimulated by light, the photoreceptor cells transmit the information along the optic nerve to the brain

Question 8

[hearing: EAR: three regions: the outer ear, the middle ear, and the inner ear]
Ear

Answer 8

-responsible for hearing and balance
-its anatomy can be divided into three regions: the outer ear, the middle ear, and the inner ear

Question 9

[hearing: EAR: three regions: the outer ear, the middle ear, and the inner ear]
Outer ear

Answer 9

Collects sounds and transmits them to the tympanic membrane, which separates the outer ear from the middle ear

Question 10

[hearing: EAR: three regions: the outer ear, the middle ear, and the inner ear]
Middle ear

Answer 10

-vibrations produced by sound are transmitted through three small bones (ossicles): the malleus, incus, and stapes
-as the vibrations pass through the oval window, they enter the inner ear
-the middle ear is also connected to the Eustachian tube, which opens into the pharynx
-this tube equalizes the pressure between the middle ear and the atmosphere, sometimes making your ears “pop“

Question 11

[hearing: EAR: three regions: the outer ear, the middle ear, and the inner ear]
Inner ear

Answer 11

-has many channels containing fluid that moves in response to your movement or to sound
-sound coming into the inner ear moves the fluid, causing the cochlea, a part of the inner ear, to transduce (or convert) the movement into signals or action potentials
-movement of the small hairs in a portion of the cochlea influences the signals sent from sensory neurons to the brain
-the semicircular canals are involved in balance

Question 12

Chemical receptors in the tongue and nasal passage

Answer 12

Received stimuli from the environment and are associated with your sense of taste and smell

Question 13

Eye diagram

Answer 13

Question 14

Ear diagram

Answer 14