The eye (coordination and response)

what is the use of rod cells?

• used to refract light into the eye

• used for color vision

• used for monochromatic night vision

• cause long sightedness

Answer explanation

Rod cells are used for monochromatic night vision, allowing us to see in low light conditions.

What are the two muscles involved in pupil reflex?

• internal intercostal muscles and external intercostal muscles

• biceps and triceps

• ciliary muscles

• circular and radial muscles

Answer explanation

The two muscles involved in pupil reflex are the circular and radial muscles.

Where are the most cone cells found?

• fovea

• optic nerve

• iris

• blood plasma

Answer explanation

The most cone cells are found in the fovea, which is responsible for sharp central vision and color perception.

What is accommodation?

• when the pupil constricts or dilates due to changes in light intensity in the environment

• A building in which someone may live or stay

• the eye's ability to adjust it's focus to clearly see objects at different distances

• The process in which the CNS generates a response to the stimuli

Answer explanation

Accommodation refers to the eye's ability to adjust its focus to clearly see objects at different distances, allowing for clear vision.

What happens to the ciliary muscle and suspensory ligaments to make the lens short and fat?

• The suspensory ligaments stretch and the ciliary muscle constricts

• ciliary muscle contract and suspensory ligaments slacken

• ciliary muscles relax and suspensory ligaments contract

• ciliary muscle and suspensory ligaments relax

Answer explanation

To make the lens short and fat, the ciliary muscle contracts, which reduces tension on the suspensory ligaments causing them to slacken.

What is meant by long-sightedness?

• unable to focus on nearby objects

• being able to clearly see things from miles away

• unable to focus on distant objects

• it is the same as short-sightedness

Answer explanation

Long-sightedness refers to being unable to focus on nearby objects, not distant ones. It is the opposite of short-sightedness.

What is the role of the optic nerve?

• controls the number of cone and rod cells that are in the eye

• transmits visual information to the brain

• enhances vision

• produces tears

Answer explanation

The role of the optic nerve is to transmit visual information to the brain.

What happens to the lens when the eye focuses on a distant object?

• The circumference of the lens increases

• The lens becomes more transparent.

• The lens becomes thick and short

• the lens becomes long and thin

Answer explanation

When the eye focuses on a distant object, the lens becomes long and thin to adjust the focal length and bring the object into focus.

What is the function of the cornea in the eye?

• It controls the amount of light entering the eye

• It helps in focusing light onto the retina

• It produces tears to keep the eye moist

• It is responsible for color vision

Answer explanation

The function of the cornea in the eye is to help in focusing light onto the retina.

What is the role of the iris in the eye?

• It helps in detecting light intensity

• It controls the size of the pupil

• It transmits visual information to the brain

• It helps in adjusting the lens shape

Answer explanation

The iris controls the size of the pupil in the eye, regulating the amount of light that enters the eye.