Lab 6

Question 1

skin has a variety of sensory receptors that respond to different..

Answer 1

types of external stimuli

Question 2

free nerve endings?

Answer 2

branching tips of sensory nerves, respond to touch, pain, temp, most common receptor

Question 3

tactile discs?

Answer 3

extremely sensitive to fine touch and light pressure

Question 4

tactile corpuscles?

Answer 4

respond to fine touch and light pressure, especially in eyelids, lips, fingertips

Question 5

lamellated corpuscles?

Answer 5

respond to deep pressure in skin, muscles, joint capsules,

Question 6

ruffini corpuscles?

Answer 6

respond to pressure and distortion in dermis

Question 7

are the cutaneous receptors for pressure phasic or tonic?

Answer 7

phasic except pain

Question 8

pain receptor (nociceptors) are tonic of phasic?

Answer 8

tonic

Question 9

phasic receptor vs tonic

Answer 9

phasic= strong response at first, rapidly declines
tonic= continue to fire with stimulation

Question 10

what is it called when pain can be felt in a region different from the site of the stimulus?

Answer 10

referred pain (brain freeze) examples, heart attack causing pain to shoulder
pancreatic pain causing pain in back
thought to happen when nerve fibers from regions of high sensory input, like the skin, and nerve fibers from normally low input happen to converge on the same levels of the spinal cord

Question 11

vision organ

Answer 11

eye/retina

Question 12

hearing organ

Answer 12

ear/cochlea

Question 13

balance organ

Answer 13

vestibule/semicircular ducts/ear

Question 14

olfaction organ

Answer 14

nose

Question 15

gustation organ

Answer 15

taste buds/tongue

Question 16

outer ear consists of?

Answer 16

auricle or pinna, external auditory canal

Question 17

middle ear consists of?

Answer 17

auditory tube, malleus, incus, stapes

Question 18

inner ear consists of?

Answer 18

oval window, cochlear duct, basilar membrane, hair cells, semicircular, vestibule

Question 19

nerve deafness means?

Answer 19

cochlea or cochlear nerve is damaged

Question 20

conduction deafness means?

Answer 20

tympanic membrane or ossicles are damaged

Question 21

fibrous tunic?

Answer 21

sclera, cornea; outermost layer

Question 22

vascular tunic?

Answer 22

choroid, ciliary body, iris; blood vessels, middle layer

Question 23

neural tunic?

Answer 23

retina, innermost layer, absorbs light

Question 24

which of the structures contain sensory receptors for light?

Answer 24

neural tunic because retina

Question 25

structures in the eye responsible for retraction?

Answer 25

lens, vitreous body, cornea

Question 26

point on the retina where image is seen with greatest clarity?

Answer 26

fovea centralis

Question 27

cornea and lens act as a cornex, meaning?

Answer 27

images formed by convex lenses are inverted

Question 28

emmetropia, hypertropia, myopia

Answer 28

emme- normal eye
hyperopia- farsightedness
myopia- nearsightedness

Question 29

refraction of light =?

Answer 29

bending of the light as it passes through eye

Question 30

what happens to the near focus as we age?

Answer 30

near focus gets further away with increasing age

Question 31

how many different cones are there?

Answer 31

3, each respond maximally to a different colour; red, blue, green

Question 32

what is the blind spot?

Answer 32

spot on the optic disc with no rods and cones

Question 33

where is the optic disc relative to the fovea?

Answer 33

optic disc is medial to the fovea

Question 34

what type of photoreceptor is needed for perception of colour?

Answer 34

cones

Question 35

where in the retina do you have the greatest concentration of cones?

Answer 35

center because the most cones are in the fovea in the center of the eye

Question 36

why are objects in the peripheral vision visible, but unclear?

Answer 36

there are more rods in the peripheral- rods detect in low light but do not make it clear as to what you are seeing