The Senses Flashcards
Give a function of the eyelids
Can cover and protect the eyes
Give a description of the conjunctiva
Thin transparent lining protecting the cornea from infection
Give a description of the cornea
Front transparent part of the sclera. Focuses light rays on the retina
Give a description of the sclera
Tough fibrous outer layer, the ‘white’ of the eye, maintains shape of eyeball
Give a description of the choroid
Contains blood vessels supplying food and oxygen to the cells of the eye
Give a description of the retina
Innermost layer of the eye that contains receptor cells
What are the different types of receptor cells in the eye, and what do they detect
Rods = black and white
Cones = colours
Give a description of the optic nerve
Carries impulses from the receptor cells to the cerebrum
Give a description of the aqueous humor
A salt solution that holds the front of the eye in shape
Give a description of the vitreous humor
Supports the eye by excepting an outward pressure on the eyeball
Give a description of the fovea
Area at the back of the eye where our best vision is (only cones)
What are some advantages of having 2 eyes
- Depth perception
- 3D vision
Give a description of the iris
Contains blood vessels and melanin and controls the amount of light entering the eye
What happens to the pupil in bright and dim lights
Bright = constricts
Dim = dialates
Give a description of the pupil
The black circle in the front of the eye, let’s light into the eye
Give a description of the ciliary muscle/body
Thickened edge of the choroid that controls the shape of the lens
Give a description of the lens
Focuses the light rays on the retina
Give a description of the suspensory ligament
Holds the lens in place
Give a description of the blind spot
Where the optic nerve leaves the retina, no receptor cells
Give a description of the pinna
Outer visible ear that funnels sound into the ear canal
Give a description of the auditory canal
Carries vibrations to the eardrum, has hairs and wax glands to trap dirt
Give a description of the eardrum
Vibrates when sound waves hit it, carrying sound into middle ear
Give a description of the ossicles
3 small bones [Hammer, anvil stirrup] that amplify sound and pass them on to the cochlea in the inner ear
Give a description of the eustachian tube
Keeps air pressure on each side of the ear drum, connected to pharynx
Give a description of the semi-circular canals
Help us keep our balance and posture
Give a description of the cochlea
Responsible for hearing, converts vibrations into electrical impulses that are sent to the brain along the auditory nerve
Give a description of the organ of corti
In the cochlea and contains receptor cells that allow hearing
