SEARS

Front

What is sensation?

Back

Conscious or subconscious awareness of changes in the external or internal environment; involves a stimulus reaching the brain.

Front

What are the four conditions that must be satisfied for sensation to occur?

Back

1. A stimulus must occur and activate a receptor. 2. A receptor must convert the stimulus into nerve impulses. 3. The nerve impulse must be conducted to the brain. 4. The brain must receive and integrate the nerve impulses into a sensation.

Front

What is perception?

Back

Conscious awareness and interpretation of sensations, primarily a function of the cerebral cortex.

Front

What is adaptation in sensory receptors?

Back

A decrease in the strength of sensation during prolonged stimulus due to decreased responsiveness of receptors.

Front

What are the two types of adapting sensory receptors?

Back

1. Rapidly Adapting: Pressure, touch, smell. 2. Slowly Adapting: Pain, body position.

Front

What are free nerve endings?

Back

Bare dendrites associated with pain, thermal, tickle, itch, and some touch sensations.

Front

What are mechanoreceptors?

Back

Receptors that detect mechanical pressure and provide sensations of touch, pressure, vibration, proprioception, and hearing.

Front

What do thermoreceptors detect?

Back

Changes in temperature.

Front

What are nociceptors?

Back

Receptors that respond to painful stimuli resulting from physical or chemical damage to tissue.

Front

What are photoreceptors?

Back

Receptors that detect light that strikes the retina of the eye.