The Senses 15-3
Vision How do you see? Your eyes respond to the external stimulus of light They convert that stimulus into impulses that your brain then interprets, enabling you to see.
The Eye- how you see
Vision Problems Nearsightedness: See nearby objects clearly, but can’t see far away. This is because the retina is too long and objects don’t focus sharply on the retina. Farsightedness: See far away but not things close up. The cornea is too short and the image doesn’t focus sharply on the retina
Myopia & Hyperopia
Hearing Sound is produced by waves of energy Travels through air, liquid, or solids The ear picks up sound waves, converts them to nerve impulses that are interpreted by the brain.
Anatomy of the Ear
The Ear & Balance You maintain your balance because of structures in the inner ear. Semicircular canals filled with fluid makes the hair like structures inside the canal bend. This sends impulses via sensory neurons to the cerebellum The cerebellum adjusts your balance continually to maintain your position.
Smell & Taste Smell & taste work together Depend on chemicals Chemicals trigger responses in receptors that are sent as nerve impulses to the brain where they are interpreted as either taste or smell
Areas of the brain for taste & smell
Touch Not found in a specific place in the body Found throughout the skin The skin has different types of receptors Light touch Heavy touch Pain Temperature change
The skin is the largest sense organ Light touch receptors: Upper part of the dermis, tells you when you touch something and how things feel. Deep touch receptors: respond to pressure Pain sensors: alert you to danger Temperature sensors: give you information about your surroundings