HLTAP301A
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Allows us to experience the world
Sight
Touch
Hearing
Pain
Speech
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Chemo receptors receive changes in chemical
concentration
Pain receptors receive information stimulated
by tissue damage
Thermo receptors sense change in
temperature
Mechanoreceptors changes in pressure or
body movements
Photoreceptors are stimulated by light
The nose
 Sense of smell is called the olfactory sense
 Stimulated by chemicals that dissolve in the
moisture of nasal tissue
 Impulse travels along olfactory nerve to the
temporal lobe
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Conscious awareness of information coming
in
The tongue
 Taste buds are the organs of taste
 Sensitive to chemicals in our food
 Sensations are
1. Salty
2. Sweet
3. Sour
4. Bitter
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Tip is sensitive to sweet and salty
Sides are sensitive to sour
Back is sensitive to bitter
Impulse travels along two cranial nerves to
the parietal and temporal lobes
The eye
 Eyebrows are patches of hair above the eyes
to protect from perspiration and shade the
eyes
 Eyelids protect the eyes
 Eyelashes trap dust and foreign objects
 Tears moisten, lubricate and clean the surface
of the eye
Eyeball composed of 3 layers
1.Sclera outermost layer containing the
contents of the eye, shapes the eye, the
white of the eye
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Cornea sits on the front of the sclera,
window of the eye
2.Choroid middle layer provides retina with
blood
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Forms the ciliary body and iris
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Secretes aqueous humor
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Iris is coloured part of eye
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3. Retina
 Innermost layer
 Lines the back 2/3 of the eyeball
 Nervous layer
 Contains visual receptors called rods and
cones
The ear
 Divided into 3 parts
1. External
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Part that you can see
Pinna is the cartilage part
Opens to the external auditory canal
Extends to eardrum
Lined with hair to prevent dust from entering and
produces ear wax
2. Middle ear
◦ Small, air filled chamber between eardrum and
bones
◦ Nerves and blood supply eardrum vibrates with
sound waves and sound is sent to bones
◦ Contains the malleus, incus and stapes
3. Inner ear
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Tubes hollowed out of temporal bone
Filled with fluid
Contains the cochlea
Receptors for hearing