Receptors and Sensations page 455

1. Receptor types a. Each type of receptor is sensitive to a distinct type of stimulus.

b. The major types of receptors include the following:

(1) Chemoreceptors, sensitive to changes in chemical concentration.

(2) Pain receptors, sensitive to tissue damage.

(3) Thermoreceptors, sensitive to temperature changes.

(4) Mechanoreceptors, sensitive to mechanical forces.

(5) Photoreceptors, sensitive to light.

2. Sensory impulses a. When receptors are stimulated, changes occur in their membrane potentials.

b. Receptor potentials are transferred to nerve fibers, triggering action potentials.

3. Sensations a. Sensations are feelings resulting from sensory stimulation.

b. A particular part of the sensory cortex interprets every impulse that reaches it in the same way.

c. The cerebral cortex projects a sensation back to the region of stimulation.

4. Sensory adaptations are adjustments of sensory receptors to continuous stimulation. Impulses are triggered at slower and slower rates.

Essentials of Human Physiology

Essentials of Human Physiology

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