Sensory Receptors

Question 1

speciicity of nerve ibers for transmitting only one modality of sensation

Answer 1

labeled line principle.

Question 2

Diferent recep­
tors can be excited in one of several ways to cause recep­
tor potentials

Answer 2

1) by mechanical deformation of the
receptor, which stretches the receptor membrane and
opens ion channels; (
2) by application of a chemical to the
membrane, which also opens ion channels; (
3) by change
of the temperature of the membrane, which alters the
permeability of the membrane; or (
4) by the efects of
electromagnetic radiatio

Question 3

slowly adapting receptors include

Answer 3

1) receptors of the macula in the vestibular apparatus, (
2) pain recep­
tors, (
3) baroreceptors of the arterial tree, and (
4) chemo­
receptors of the carotid and aortic bodies.

Question 4

Receptors that adapt rapidly cannot be used to transmit a continuous signal
True or False

Answer 4

True

Question 5

in the case of the Pacinian corpuscle, sudden pressure applied to the tissue excites this receptor for a few milliseconds, and then its excitation is not over while the pressure continues
True or False

Answer 5

False. its excitation is over even though the pressure continues.

Question 6

the larger the diameter, the greater the conducting velocity.
True or False

Answer 6

True

Question 7

conduct impulses at low velocities

Answer 7

Type C ibers are the small unmyelinated nerve ibers

Question 8

neuronal area stimulated by each incoming nerve iber is called

Answer 8

stimulatory field