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Two major categories of sensory receptors:

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Two major categories of sensory receptors:

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1. Somatic senses
2. Specialized sensory Organs

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Receptors associated with the somatic senses of touch , pressure, temperature, and pain form one group.

These receptors are widely distributed throughout the skin, muscle, joints, and deeper tissues.

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Special senses of smell, taste, hearing, vision, and equilibrium.

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Chemoreceptors  - are stimulated by changes in the chemical concentration of substances. (Taste and smell)

Pain receptors - by tissue damage

Thermoreceptors - by changes in temperature

Mechanoreceptors - by changes in pressure or movement

Photoreceptors  - by light energy

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When sensory receptors are continuously stimulated, many of them undergo an adjustment called sensory adaption.

As receptors adapt, impulses leave them at decreasing rates, until finally theses receptors may stop sending signals.

Example: a person walks into a room with a strong smell, the longer the person is in the room, the less noticeable the smell is.

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Are feeling that occur when the brain interprets sensory impulses

All nerve impulses that travel away from sensory receptors into the central nervous system are alike, the resulting sensation depends on which region of the brain is stimulated.

An example would be the smell of a Apple scented candle.

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The brain projects the sensation back to its apparent source

Projection allows a person to pinpoint the location of stimulation: thus the eyes seem to see, and the ears seem to hear.