Visual System

Question 0

This is the LARGER chamber of the eye located BEHIND the LENS.

Answer 0

Vitreous Humor

Fig 6.4 p.132

Question 1

This is the SMALLER chamber of the eye located in the FRONT of the LENS.

Answer 1

Aqueous Humor

Fig 6.4 p.132

Question 2

Name the 3 layers of the EYE.

Answer 2

Sclera
Choroid
Retina

Fig 6.4 p.132

Question 3

The CORNEA is the translucent later in front of the _____________.

Answer 3

Sclera

Fig 6.4 p.132

Question 4

This is the INNERMOST layer of the eye and contains receptors for vision.

Answer 4

Retina

Fig 6.5 p.134

Question 5

This part of the eye PREVENTS the ESCAPE OF LIGHT from the eye.

Answer 5

Choroid Layer

Fig 6.4 p.132

Question 6

These EYE MUSCLES are on the OUTSIDE of the eyeball and are responsible for EYEBALL MOVEMENT.

Answer 6

Extrinsic Muscles

Fig 6.4 p.132

Question 7

These muscles are on the INSIDE of the eyeball .

Answer 7

Intrinsic Muscles

Fig 6.4 p.132

Question 8

These INTRINSIC muscles CONTROL the LENS.

Answer 8

Ciliary Muscles

Fig 6.4 p.132

Question 9

These INTRINSIC muscles CONTROL the PUPIL.

Answer 9

Iris

Fig 6.4 p.132

Question 10

These are PRIMARY RECEPTOR NEURONS that are RESPONSIVE TO LIGHT. (2)

Answer 10

Rods
Cones

Fig. 6.5 p.134

Question 11

True or False: rods and cones are specialized receptors.

Answer 11

TRUE, rods and cones are SPECIALIZED

Question 12

These NEURONS synapse with receptor cells and occur in the SECOND ROW.

Answer 12

Bipolar Neurons

Fig. 6.5 p.134

Question 13

The bipolar neurons bring the impulse to the THIRD GROUP of neurons called __________.

Answer 13

Ganglion Cells

Fig 6.5 p.134

Question 14

This occurs when the axons of ganglion cells EXTEND OVER the INNER SURFACE OF THE RETINA and form the the optic nerve.

Answer 14

Blind Spot

Fig. 6.5 p.134

Question 15

These LATERAL NEURONS pick up info FROM RECEPTOR CELLS and spread effects TO several BIPOLAR NEURONS.

Answer 15

Horizontal Cells

Fig 6.5 p.134

Question 16

These LATERAL NEURONS pick up info FROM BIPOLAR CELLS and spread effects TO several GANGLION CELLS.

Answer 16

Amacrine Cells

Fig 6.5 p.134

Question 17

CONES are concentrated at the ____________ part of the back of the retina and become sparser in the ____________.

Answer 17

Central
Periphery

Fig. 6.9 p.137

Question 18

The RODS are NUMEROUS in the ___________ and ABSENT in the ____________ of the retina.

Answer 18

NUMEROUS in PERIPHERY

ABSENT in the CENTER

Fig. 6.9 p.137

Question 19

This is the part of the retina BEHIND the LENS also known as the YELLOW SPOT.

Answer 19

Macula Lutea

Fig. 6.6 p.136

Question 20

This is located in the CENTER OF the MACULA LUTEA of the retina.

Answer 20

Fovea Centralis

Fig. 6.6 p.136

Question 21

Fovea Centralis is the area of _____________ vision and contains ___________ cones.

Answer 21

Sharpest vision
50,000 cones

Fig. 6.6 p.136

Question 22

Why does the FOVEA produce such a SHARP IMAGE?

Answer 22

Because the BIPOLAR and GANGLION CELLS are drawn aside at an OBLIQUE ANGLE so that the CONES ARE EXPOSED TO LIGHT RAYS.

Fig 6.6 p.136

Question 23

The VARIOUS KINDS OF LIGHT may be specified in terms of what TWO (2) VARIABLES?

Answer 23

Intensity

Wavelength

Question 24

This is the UNIT commonly employed for DESIGNATION OF WAVELENGTH.

Answer 24

Millimicron

Question 25

VERTABRATE eye SENSITIVE to WAVELENGTHS between ____ and ____ millimicrons.

Answer 25

380-760

Question 26

This depends on SIZE OF PUPIL through which light enters the eye.

Answer 26

Retinal Illumination

Question 27

This depends on RETINAL ILLUMINATION.

Answer 27

Size of Pupil

Question 28

True or False: the wider the APERTURE the sharper the focus of the retinal image.

Answer 28

FALSE, the NARROWER the aperture the sharper the focus of the image

Question 29

The FOCUS IS BEST when the illumination is _________ and the pupil is _________.

Answer 29

High

Constricted