CCEA A2 Biology The Eye
2024 GRADED A+
Conjunctiva ️️correct answer-The thin transparent
membrane covering the cornea and lining the eyelids. It
protects the cornea at the front of the eyeball.
CCEA A2 Biology The Eye
2024 GRADED A+
Conjunctiva ✔️✔️correct answer-The thin transparent
membrane covering the cornea and lining the eyelids. It
protects the cornea at the front of the eyeball.
Pupil ✔️✔️correct answer-The gap within the iris that appears
black and allows light to enter the eye. Its size can be varied.
Aqueous humour ✔️✔️correct answer-The transparent watery
fluid that fills the front part of the eye to maintain the shape
of the front of the eye.
Lens ✔️✔️correct answer-The transparent and elastic
biconcave structure held in place behind the cornea. It changes
shape to adjust the focus of light onto the retina.
Iris ✔️✔️correct answer-The coloured part of the eye
containing circular and radial muscles. It controls the size of the
pupils by alternating constriction and relaxation between the
muscles to adjust the amount of light entering the eye.
Suspensory ligament ✔️✔️correct answer-Strong ligaments
which connect the ciliary body to the lens
, Ciliary body ✔️✔️correct answer-Structure which supports
the lens and contains circular muscle. contraction or relaxation
of the muscle controls the shape of the lens.
Blind spot ✔️✔️correct answer-The region where the optic
nerve leaves the inside of the eyeball and so contains no light-
sensitive cells. This region isn't sensitive to light.
Sclera ✔️✔️correct answer-Tough connective tissue that
encloses the eye, except at the front. Protects the eyeball
against mechanical damage and allows attachment of eye
muscles. (The white coating)
Vitreous humour ✔️✔️correct answer-Transparent, jelly like
material filling the rear part of the eyeball. Maintains shape of
the rear part of the EB, and supports the Lens.
Cornea ✔️✔️correct answer-The front part of the sclera that
is transparent to light (allows passage of light while refracting
it).
Accomodation ✔️✔️correct answer-The adjustment of lens
thickness to ensure that light rays are focused on the retina,
irrespective of the angle of light rays reaching the eyes.
Radial muscles (iris) ✔️✔️correct answer-A smooth muscle in
the eye that runs radially in the iris (like the spokes on a
bicycle). In LOW LIGHT intensities radial muscles contract
(circular relax) making the pupils LARGER.
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