Lab 10 past Qs

Question 1

How can we determine the minimal hearing threshold?x

Answer 1

(increase the sound frequency until the test subject can hear the sound. the minimum
hearing threshold is the first value (in Hz) at which the test subject can hear the sound )

Question 2

Where in the body the cutaneous sensation is more accurate?

Answer 2

palm, sole,lip, nose)

Question 3

What is the role of the outer ear canal?|

Answer 3

forwarding the sound waves towards inner ear , ossicles

Question 4

What is the role of the ossicles?

Answer 4

amplify and transmit the signal to the inner ear ( cochlea)

Question 5

Describe Weber’s illusion :

Answer 5

exact perception of certain objects is different on various skin regions due to the number
of receptors located in the given area

Question 6

What is the unit of sound?

Answer 6

decibels dB= 10 log (I1/I2)

Question 7

What is the measurement of sound?

Answer 7

Hz

Question 8

What is the area on the retina, which has most visual acuity?

Answer 8

Macula luteum

Question 9

Where in the brain is vision processed?

Answer 9

visual cortex of occipital lobe)

Question 10

What are the junctions of ossciles in middle ear?

Answer 10

little bones located in the middle ear:eardrum to hammer ,anvil, stirrup to cochlea

Question 11

Why does the distribution of colors vary in field of vision?

Answer 11

(different distribution of color sensitive receptors

Question 12

What is binocular disparity?

Answer 12

there is a given distance between the 2 eyes so an object projects to the fovea centralism
of the retina in both eyes but all other points that are in front or behind project to other
locations of retina

Question 13

Before reaching receptors cells, light refracts where?

Answer 13

(the border of the cornea, the aqueous humour, the lens and the virtuous body)

Question 14

What is astigmatism?

Answer 14

blurred vision due to inability of the optics of the eye to focus a point object into a sharp
image on the retina

Question 15

Describe the genetic background of red-green color blindness:

Answer 15

(inheritable recessive alleles of X sex chromosome. Recessive allele in woman causes
problems on heterozygote form, in man it is hemizygote)

Question 16

. Accommodation triad?

Answer 16

adaptable curvature of the lens
eye movements
pupil function

Question 17

Hearing range in human?

Answer 17

20-20000 Hz

Question 18

Why visual field isn’t circular?

Answer 18

(due to different structures on the face (e.g. nose, ears, etc.) might be covered
by some parts of the theoretical field of vision

Question 19

What are dB?

Answer 19

(scale measure for intensity of sound

Question 20

Viewing angle?

Answer 20

(Max angle at which a display can be viewed with acceptable visual performance)

Question 21

Measure of min viewing angle?

Answer 21

arcmin

Question 22

Methods to find the blind spot?

Answer 22

Mariotte card + perimeter

Question 23

Thermoreceptors?

Answer 23

(Non specialized sensory receptor that codes absolute and relative changes in temp

Question 24

define blind spot of retina

Answer 24

position of optic disk, no photoreceptors - no image detection in this area

Question 25

what is the biological explanation of the retinal after image?

Answer 25

an image that continues to appear in one’s vision after the exposure to the original image has ceased.

Question 26

name 5 parts of the reflex arch

Answer 26

receptor, afferent nerve, CNS, efferent nerve, effector

Question 27

give an example of supporting roles

Answer 27

one of the parts of the reflex arch?