Eye and ear 👁️👂 Flashcards
Two light receptor cells in retina
Rods and cones
Function of rods
Vision in dim light
Function of cones
Vision in bright light and to detect colour
Explain why damage to optic nerve could result in blindness
No impulse will be sent to the brain
One corrective measure for long sightedness
Convex lens
Name another sense except for vision and hearing and an organ associated with it
Touch and skin
Function of optic nerve
To send impulse from the eye to the brain
Function of iris
To control amount of light entering the eye
Function of Eustachian tube in the ear
To equalise pressure
Function of semi-circular canals in the ear
To control balance
Name and explain the fluid that fills the rear chamber
Vitreous humour,
Gives shape
Name and explain two types of receptor cells
Rods and cones,
Rods work in dim light,
Cones work in bright light
Name and explain the transparent covering on cornea
Conjunctiva,
Moistens
Advantage of having two two eyes
3D vision
Disorder of eye and corrective measure
Long sightedness and convex lens
How is the lens of the eye adapted for focusing light
Transparent and curved
Name the part of eye that has corresponding function to the cochlea of the ear
Retina, both send impulses to the brain
Name the structure that determines the diameter of the pupil
Iris
Why is there a mechanism for changing the diameter of the pupil
To let more light enter the eye
Two parts of the eye that are transparent and have curved surfaces
Cornea,
Lens
How does curvature contribute to the functioning of the eye
To bend light
Rye eyes of carnivores are located close together at the front of the skull, why is this a benefit
Better focus on prey
In what part of the eye are nerve pulses generated
Retina
Suggested one way in which the ear may be protected
Skull
Explain how a corrective measure for a named defect of hearing works
glue ear,
grommets, force air into middle ear and forces fluid put
Explain how the Iris works
Contraction in response to light intensity
