Our sense of smell

1
Our sense of smell

• Odors enter the nose in tiny chemical droplets
• Receptors in the nose convert the chemical odor
  into a nerve impulse
• Impulse travels to the olfactory lobes of the
  brain
• Brain interprets odor as something that smells.

2
Smallest bones in the body

• Three bones in the middle ear
• Malleus (hammer)
• Incus (anvil)
• Stapes (stirrup)

3
How we hear!

• Sound enters the ear
• Sound waves picked up by tympanum (eardrum)
• Tympanum vibrates
• Vibrations cause ossicles (ear bones) to move
• Vibrates the liquid in the cochlea
• Vibrations sent to nerve endings in cochlea
• Impulses sent on auditory nerve to brain

4
A question of balance.

• Changes in movement can effect your balance
• Semicircular canals
• 3 fluid filled canals
• Hair like nerve cells stimulated by movements
• Nerve impulse sent to brain

5
Skin

• Layers (tissues)
• Epidermis
• Dermis
• Subcutaneous (fat)
• Sebaceous gland
• Oil gland
• Sensory nerve endings
• Blood vessels
• Sweat glands

6
Skin function

• Sweat
• Liquid released from sweat gland to cool the body
• Water on the skin evaporates and cools the body

7
Acne or pimples

• Caused by blocked pores in skin
• Bacteria builds up and causes red/sore area
• Treatment?
• Wash face with mild soap and water regularly