1. Senses
Chapter 29

2. What you need to know!
The location and function of sensory receptors

3. Sensation vs Perception
Sensation is when the brain receives input from the senses
Black splotches
Perception is when the brain constructs meaning from the sensation
Dog

4. Sensory Receptors
Sensory receptors are specialized neurons that detect energy
Sensory receptors transform the energy of the stimuli into a receptor potential (graded action potential)
Sensory receptors can adapt to continuous stimuli
Hot shower becomes bearable
Comfort adjusts to the cold ocean
Skunk smell dissipates over time (so does your body odor)

5. Vision
Electromagnetic receptors – detect electricity, magnetism or light
Photoreceptors – most common electromagnetic receptors
Rods are hypersensitive and see shades of grey; they make up our night vision and periphery (125 million)
Cones see color and are focused in your fovea (6 million)

6. Hearing
Mechanoreceptors – stimulated by mechanical energy (including sound waves)
The ear bones rattle the fluid in the cochlea making waves
Auditory receptors detect the frequencies of the fluid movement

7. Skin Receptors
Pain receptors – detection of damage (or potential damage), everywhere but the brain
Thermoreceptors – detect either heat or cold
Mechanoreceptors – detect mechanical energy such as touch, pressure, stretching, motion

8. Smell & Taste
Chemoreceptors – attuned to chemicals in our environment and within our body (homeostasis)

9. Sensation vs Perception