Chapter 5 sensory system

Question 1

Where are all sensations converted into impusles?

Answer 1

specialized receptors in PNS then conveyed to specific CNS targets

Question 2

True or false Neural pathways for the different systems are anatomically and functionally Same

Answer 2

fALSE , THEY ARE DISTINCT

Question 3

Mix and match the following : Chemoreceptors:
– Photoreceptors:
– Thermoreceptors:
– Mechanoreceptors:
– Nociceptors:

Answer 3

Chemoreceptors: smell, taste, pH, metabolite concentration
– Photoreceptors: retina
– Thermoreceptors: temperature
– Mechanoreceptors: physical deformation, most varied group: touch,
muscle tension, auditory vestibular receptors
– Nociceptors: pain

Question 4

Where do the cel bodies of sensory neurons reside?

Answer 4

DRG and CNG – Dorsal root ganglia and cranial nerve ganglia
, in a series of ganglia alongside of the spinal cord

Question 5

What is transduction?

Answer 5

conversion of one form of energy into
another (some physical stimulation to an electric signal–
receptor potential—that the NS can understand)

Question 6

What is sensory transduction?

Answer 6

Conversion of pressure, touch,
heat, etc. into neural impulses

Question 7

VERY IMPORTANT: nature and location of a stimulus are indicated BY?

Answer 7

e identities of the receptors that respond

Question 8

intensity and duration of a stimulus are indicated BY?

Answer 8

size and duration of the receptor potential
produced.

Question 9

True or False All stimuli elicit receptor potentials, but not all elicit action potentials.

Answer 9

True

Question 10

Most sensory receptors can be thought of as
analogous ___ and adequate stimulus can be thought of as analogous to ____.

Answer 10

post synaptic membrane and neurotransmitters

Question 11

: an area of skin where its receptive endings
reside?

Answer 11

A cutaneous receptor

Question 12

Each receptive field (RF) corresponds to multiple afferent fiber/receptor true or false?

Answer 12

False - responds to single

Question 13

What is the function of the receptive field?

Answer 13

allows the receptor to encode the location of the
stimulus

Question 14

Which parts of the body have the smallest receptive fields?

Answer 14

Generally fine touch receptors have smaller receptive fields:Tips of
fingers, lips and tongue have the finest RF

Question 15

What Slowly adapting receptors are suitable for

Answer 15

SSSD - shape, static position, size and duration

Question 16

Rapidly adapting receptors are suitable for?

Answer 16

change and movement of stimuli

Question 17

what kind of afferents is rapidly adapting encapsulated or non-encapsulated?

Answer 17

encapsulated

Question 18

What purpose does a capsule around a nerve ending serve?

Answer 18

it acts as a mechanical filter, - modifying mechanical stimuli before it reaches the ending

Question 19

Afferent neurons what do they do?

Answer 19

Carry information from sensory receptors found all over the body towards the central nervous system

Question 20

Largest afferents supply sensory receptors to?

Answer 20

muscle

Question 21

_ and _ are conveyed by the smallest afferent fibrees

Answer 21

temp and pain

Question 22

Intermediate diameter fibers what do they do ?

Answer 22

mediate touch

Question 23

Match the following receptor type to sensory function: 1. merkerl, meisner, ruffini cells pacinian , and muscle spindle, touch and proprioception

Answer 23

muscle spindle- proprioception, merker, etc. - touch

Question 24

True or false - Receptors convey different, simultaneous and
parallel information

Answer 24

true - braille

Question 25

what receptors repsond to pain

Answer 25

nociceptors

Question 26

When do nociceptors respond?

Answer 26

only begin to respond when stimulus
reaches intensive levels and continues to increase
with the stimulus.

Question 27

Pain pathway bro - what do second order neurons do?

Answer 27

s decussate and ascend in
the anterior-lateral spinothalamic tract, to the
thalamus

Question 28

Where does the pain pathway decussate?

Answer 28

spinal level

Question 29

What is the role of proprioceptors?

Answer 29

Internal information about limb position,
muscle force, muscle tension and joint stress
are conveyed by it

Question 30

Which body parts have most dense muscle
spindles?

Answer 30

Jaw muscles and tongue

Question 31

wht are muscle spindles?

Answer 31

Large myelinated afferents
surround muscle fibers

Question 32

where does conscious perception of tactile etc. arise?

Answer 32

Primary sensory cortex