PNS System

Question 1

4 Basic structural components:

Answer 1

• sensory receptors
• ganglia
• nerves
• motor endings

Question 2

3 different classifications of receptors

Answer 2

stimulation, location, structural complexity

Question 3

Stimulation type:

Answer 3

Mechanoreceptors- touch, pressure, vibration
Nociceptors- excess stimuli; pain
Photoreceptors- Respond to light
Thermoreceptors- Changes in temperature
Chemoreceptors- Blood chemistry., smell, taste

Question 4

Location

Answer 4

Proprioceptors- Skeletal muscles, tendons, joints, ligaments, & CT of bones & muscles; body movements
Interoreceptors- Sensitive to chemical changes, tissue
stretch, & temperature change
Exteroreceptors- Skin, touch, pressure, pain, temp.
Most special sense organs

Question 5

Encapsulated nerve endings

Answer 5

Meissener's corpuscle
Pascinian Corpusle
Ruffini Endings
Joint kinesthetic Receptors
Golgi tendon
Muscle spindles

Question 6

Unencapsulated nerve endings

Answer 6

Thermoreceptors- Cold 10-35 Superficial Hot 32-48 Deeper
Itch receptors- Histamine
Light tough receptors- Tactile [merkel] discs & hair follicle receptors
Nociceptors- Chemicals from damaged tissue
Temperatures out of range of thermoreceptors
Capsaicin