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Biology > sense organs (eyes) > Flashcards

sense organs (eyes) Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

what is the exact function of the iris

A

the pigment of the iris is responsible for the color of the eye

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2
Q

what is the exact location of the lacrimal gland

A

the lacrimal gland is located in the upper lateral region of each orbit

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3
Q

which layer forms the iris

A

choroid layer

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4
Q

aqueous humor is present between ______ and _____

A

cornea and iris

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5
Q

the layer of the eyeball that forms the transparent cornea

A

choroid layer

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6
Q

which lens is required to correct Myopia

A

concave

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7
Q

what is the exact location of the ciliary body

A

The exact location of the ciliary body is at the junction of the choroid and iris.

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8
Q

the pigment in rod cells

A

rhodopsin

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9
Q

the pigment in cone cells

A

iodopsin

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10
Q

what is vitreous humor

A

the fluid that occupies the larger cavity of the eyeball behind the lens is called vitreous humor

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11
Q

WHAT IS CONJUCTIVA

A

it is a thin membrane covering the entire front part of the eye

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12
Q

the lens of the eye losing flexibility resulting in a kind of long-sightedness in middle-aged people

A

PRESBYOPIA

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13
Q

what is the function of the suspensory ligament of the eye

A

holding of the eye lens in position

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14
Q

what is the exact location of the yellow spot

A

CENTRE OF HORIZONTAL AXIS OF THE EYEBALL ON RETINA

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15
Q

WHAT IS THE YELLOW SPOT ALSO CALLED

A

MACULA LUTEAU

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16
Q

why can’t we distinguish colors in moonlight

A

in moonlight rods/rhodopsin helps us to see whereas cones/iodopsin helps us to see color vision which only gets activated only in bright light

17
Q

what is the function of the iris

A

regulates the amount of light entering the eye

18
Q

which is the part of the human eye that contains both rods and cones

A

retina

19
Q

what is presbyopia

A

it is the long-sightedness in elderly people in which eye lens loses flexibility

20
Q

what does the optic nerve do

A

carries visual stimuli from the retina to the brain

21
Q

what is the main function of the vitreous humor

A

it is the jelly-like substance that gives shape to the eyeballs

22
Q

what causes myopia

A

the eyeball is lengthened from front to back

the lens becomes too curved

23
Q

what causes hypermetropia

A

the eyeball is shortened

the lens becomes flat

24
Q

what is cataract

A

the lens becomes opaque and vision is cut down to total blindness

25
Q

the eye defect in which the cornea becomes uneven

A

astigmatism

26
Q

why does one feel blinded for a short amount of time after coming out of a dark room

A

a person feels blinded for a short while on coming out of a dark room due to light adaptation. This happens because the diameter of the pupil is reduced to allow less light to enter the eyes

27
Q

what is the power of accommodation of the eye

A

the power to adjust the focal length of the eye is called the power of accommodation of the eye

28
Q

which cell is responsible for vision in the dark

A

Rods

29
Q

which structure protects the eye from sweat

A

eyebrows

30
Q

what is stereoscopic vision

A

it is the phenomenon of simultaneous focusing of an object in both eyes whose images by a kind of overlapping in the brain gives the 3-dimensional effect

31
Q

the function of the choroid layer

A

supplies blood and nourishes the retina

32
Q

what is the function of the suspensory ligaments

A

they hold the lens in position.

33
Q

what is the location of the fovea

A

the fovea is also called the yellow spot of the eye

34
Q

what is the function of the fovea

A

it is the place where the most acute image is formed

35
Q

which lens is used to correct hyperopia

A

convex lens

36
Q

which lens is used to correct myopia

A

concave lens

37
Q

what is hyperopia also called

A

hypermetropia

Biology (2 decks)

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