The Sensory System Flashcards
What are the five senses?
- Sight
- Hearing
- Touch
- Taste
- Smell
What is a receptor?
A cell that detests a stimulus.
What stimulus does the eye detect? and how?
It detects light from rods and cones in the retina.
What stimulus does the ear detect? and how?
It detects sounds from receptors in the cochlea.
What stimulus does the skin detect? and how?
It detects Temp, pressure and pain from receptors throughout the body.
What stimulus does the tongue detect? and how?
It detects chemicals from the taste buds.
What stimulus does the nose detect? and how?
It detects chemicals from receptors in the nasal cavity.
What do the eyelids do?
They cover and protect the eyes.
What is the conjunctiva?
It’s a thin transparent lining that protects the cornea.
What is the cornea and what does it do?
It’s the front transparent part of the sclera which focuses light on the retina.
What is the sclera?
It is the tough fibrous outer layer which maintains the shape of the eyeball (the white part of your eye).
What does the choroid do?
It contains blood vessels that supply food and oxygen to the cells of the eye.
What is the retina?
It’s the innermost layer that contains all of the receptor cells (rods and cones).
What’s the fovea?
It’s the place where are best vision is (mainly cones).
What part of the eye is specialised into another?
The front region of the choroid is specialised into the iris.
What does the Iris contain and what does it do?
It contains blood vessels and melanin (our eye colour) and it controls the amount of light that enters our eye through the pupil.
How does the pupil control light intake in the eye?
In bright light, it contracts. In dim light, it dilates.
What is the ciliary body (muscle)?
It is the thickened edge of the choroid that controls the shape of the lens.
What do the suspensory ligaments do?
Holds the lens in place.
What does the lens do?
It focuses light onto the retina like a magnifying glass.
What is accommodation?
Is the ability of the lens to change its shape (focal length) to form a clear image.
What is aqueous humour?
It is the watery liquid that supplies the lens and cornea with nutrients and helps keep the structure of them.
What is vitreous humour?
The gel that helps maintain the shape of the eye.
What is a blind spot?
It’s where the optic nerve fibres pass through the retina and there is no room for receptors.
