13. The Peripheral Nervous System

Which receptor type would you expect to find on the tongue, allowing us to taste?

The larger the receptive field, the

(a) Larger the stimulus needed to stimulate a sensory receptor

(b) Fewer sensory receptors there are

(c) Harder it is to locate the exact point of stimulation

(d) Larger the area of the somatosensory cortex in the brain that deals with the area

(e) Closer together the receptor cells

_______ receptors are normally inactive, but become active for a short time whenever there is a change in the modality that they monitor.

Match the receptor type in column B to the correct description in column A.

Column A

______    (1) Pain, itch, and temperature receptors

______    (2) Contains intrafusal fibers and anulospiral and flower spray endings

______    (3) Discriminative touch receptor in hairless skin (fingertips)

______    (4) Contains receptor endings wrapped around thick collagen bundles

______    (5) Rapidly adapting deep-pressure receptor

______    (6) Slowly adapting deep-pressure receptor

Column B

a. Bulbous corpuscles

b. Tendon organ

c. Muscle spindle

d. Free nerve endings

e. Lamellar corpuscle

f. Tactile corpuscle

The CNS interprets information entirely on the basis of the

(a) Number of action potentials that it receives

(b) Kind of action potentials that it receives

(c) Line over which sensory information arrives

(d) Intensity of the sensory stimulus

(e) Number of sensory receptors that are stimulated