1. Sensory system
HLTAP301A

2. Sensory System Allows us to experience the world Sight Touch Hearing
Pain
Speech

3. Cells that detect stimuli
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

4. Special senses 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

5. sensation
Conscious awareness of information coming in

6. Special senses The tongue Taste buds are the organs of taste
Sensitive to chemicals in our food
Sensations are
Salty
Sweet
Sour
Bitter

7. Special senses 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

8. Special senses
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

9. Special senses Eyeball composed of 3 layers
1.Sclera outermost layer containing the contents of the eye, shapes the eye, the white of the eye
Cornea sits on the front of the sclera, window of the eye
2.Choroid middle layer provides retina with blood
Forms the ciliary body and iris
Secretes aqueous humor
Iris is coloured part of eye

10. Special senses 3. Retina Innermost layer
Lines the back 2/3 of the eyeball
Nervous layer
Contains visual receptors called rods and cones

11. Special senses The ear Divided into 3 parts External
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

12. Special senses 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

13. Special senses 3. Inner ear Tubes hollowed out of temporal bone
Filled with fluid
Contains the cochlea
Receptors for hearing