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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. Smallest bones in the body.
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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.
Smallest bones in the body • Three bones in the middle ear • Malleus (hammer) • Incus (anvil) • Stapes (stirrup)
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
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
Skin • Layers (tissues) • Epidermis • Dermis • Subcutaneous (fat) • Sebaceous gland • Oil gland • Sensory nerve endings • Blood vessels • Sweat glands
Skin function • Sweat • Liquid released from sweat gland to cool the body • Water on the skin evaporates and cools the body
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