1. The Senses!

2. I. The Sensory Organs
Allow for the body to receive information from the outside world
Have specialized receptors for specific stimuli
Transmit the information to the brain (via nervous system)
Are 5 sensory organs
Skin (for touch), Tongue (for taste), Eye (for sight), Nose (for smell), Ear (for hearing)

3. II. The Skin Largest organ of the body
Main functions are to protect the body and allow for the sensation of touch
Is composed of three layers
The epidermis (“epi” meaning over); outer layers
The dermis; where sensory receptors are found
The hypodermis (“hypo” meaning low); contains fat cells (for energy and heat)

4. Types of sensory receptors in the dermis
Pain receptors
Touch and pressure receptors
Temperature receptors (hot and cold)
Certain areas of the body will have more sensory receptors than others

5. Anatomy of the skin Hair Epidermis Blood vessels Dermis Hypodermis
Sensory receptors
Fat cells
Nerve

6. Sensory Receptors in Skin

7. Touch and pressure receptors in skin

8. “Homunculus”

9. II. The Tongue Is a muscle (not an organ!)
Main functions are to allow for food to be swallowed, sense taste and create sounds (to talk)
The taste buds sense taste. Humans detect 5 tastes
Sweet (i.e. bubblegum)
Sour (i.e. lemons)
Salty (i.e. salt)
Bitter (i.e. citric fruit skin)
Umami (new; associated with aged meat taste)

10. Anatomy of the tongue
Papillae
Taste bud