1. Chemoreception
Taste, Smell, Touch

2. Sensory receptors
Rely on the transfer of matter and energy
Molecular transfer
Chemical receptors
Energy transfer
Conduction – The transfer of heat (kinetic energy) by physical contact between molecules. Includes mechanical waves and pressure waves
Convection – The transfer of kinetic energy by moving groups of molecules from one area to another
Radiation- The transfer of energy via electromagnetic waves. These include visible light, x-rays, UV- light.

3. Sensory: taste Chemoreception Taste receptors Bitter Sweet Salty Sour
Umami?
(meaty)

4. Each taste bud contains more than 100 taste receptor cells.

5. Sensory: taste Convection – movement of molecules by bulk flow
Energy transfer?
Convection – movement of molecules by bulk flow

6. Sensory: smell Smell Receptor Types: Ethereal Floral Camphoraceous
Peppermint Putrid (rotten)
Musk (Animal or sweat) Pungent

7. Diffusion : surface area
Turbinals; increased surface area for diffusion

8. Sensory: mechanoreceptors
What type of energy transfer do these types of receptors detect?

10. Hair Cells synaptic vesicles Mechanosensory Directionally sensitive
Fabulously sensitive –
Can respond to sub-nanometer displacement!
synaptic
vesicles

11. Proprioceptors What type of receptor?
This receptor detects what kind of energy transfer?
Body position, motion
Muscle contraction
Tendon stretch
Ligament movement
Proprioceptors are located within muscles, tendons, and joints.

12. Pain receptors

13. TOUCH AND RELATED SENSES
1. All Regions of our bodies are sensitive to TOUCH.
2. YOUR LARGEST SENSE ORGAN IS YOUR SKIN.
3. MECHANORECEPTORS located throughout the Skin make it possible to sense touch, pressure, and tension.
4. In humans, the receptors for touch are concentrated in the face, tongue, and fingertips.
5. Body hair also plays an important role in the ability to sense touch.  Large numbers of Mechanoreceptors are found in the skin at the base of hair follicles.
6.  Our Skin has several different types of Sensory Receptors that are just below the surface of the Skin.
7.  Two Types respond to Heat or Cold - THERMORECEPTORS; Two others respond to TOUCH - MECHANORECEPTORS; one Type responds to TISSUE DAMAGE WHICH CAUSES PAIN - PAIN RECEPTORS.
8. Sensory receptors for Hot or Cold are scattered directly below the surface of the skin. There are THREE to FOUR WARM Receptors for every COLD Receptor.
9. Sensory Receptor can be more concentrated in different places of our bodies.
10. The MOST TOUCH-Sensitive areas are the FINGERS, TOES, AND LIPS.
11.  Pain Receptors are located throughout the skin.  The Sensation of Pain can be experienced as either Prickling Pain (FAST PAIN) or Burning and Aching Pain (SLOW PAIN). Pain receptors are Stimulated by mechanical, thermal, electrical, or chemical Energy.

14. Sense
Energetic transfer used
Sight
Radiation -- electromagnetic waves
Hearing
Conduction – mechanical (sound) waves
Taste
Convection – movement of molecules via bulk flow
Smell
Convection – movement of molecules via diffusion and bulk flow
Touch/heat
All Three!

15. Touch Receptor types Touch receptor type What it senses Pain receptors
Intense pressure or heat – imminent or actual tissue damage
Thermoreceptors
Heat
Mechanoreceptors
Pressure, vibration, Body position

16. Receptor type
Senses Using Them
Pain Receptors
Touch
Thermoreceptor
Mechanoreceptors
Touch, Hearing
Chemoreceptors
Taste, Smell
Electromagnetic receptors
Sight

17. What you should be able to do:
Identify which energetic process is responsible for transmitting information to each sense organ.
Explain how the property of sensation derives from a pattern of responses from cells that sense different stimuli (Colors from 3 types of cones, taste from 4-5 types of receptors, etc.).
Explain how receptor specificity for chemoreception works.
Explain the importance of sensory information to survival.
Identify the location of sensory cells for each sense (Taste bud, nasal passages, skin).
Identify which senses detect energy patterns and which detect patterns in matter.