Summary Life sciences. Grade 11 IEB- receptor- eye
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Course
Life Sciences
Institution
11th Grade
Book
Life sciences.Grade 11 IEB, 3 In 1
Comprehensive study document! Perfect for grade 11 Life Sciences (Biology) students, this guide delves into the intricate structure and function of ear receptors. Understand how we perceive sound and maintain balance through detailed explanations, diagrams, and key concepts. Ideal for exam preparat...
-outer fibrous layer: sclera, cornea
Sclera: thick layer of white inelastic connective tissue that forms the outer layer of
the eyeball and extends to the cornea at the front
FUNCTION: to protect the internal parts of the eyeball, helps to maintain spherical
shape of eye, for muscle attachment
Cornea: transparent front part of the sclera, more convex than rest of eyeball
FUNCTION: to let light rays through to inner layer of eye, causing refraction of
incoming light rays
-middle vascular layer: choroid, ciliary body, suspensory ligaments, lens, iris, pupil
Choroid: thin darkly pigmented vascular layer
FUNCTION: to absorb excess light rays to prevent internal reflection which may cause
blurred images. Blood vessels supply oxygen and nutrients to cells
Ciliary body: thickening of front part of choroid. Consists of involuntary muscles
[ciliary muscles]. Attached to lens by suspensory ligaments.
FUNCTION: to relax and contract to change curvature of lens during accommodation
Iris: round coloured structure situated in centre of the eye. Contains pigments and
two sets of involuntary muscles . Radial and circular muscles found here. Opening in
middle of iris is the pupil.
FUNCTION: to regulate the amount of light entering the eye by controlling the size of
the pupil
Lens: rubber, elastic and transparent. Bio convex structure that changes shape.
FUNCTION: changes shape to refract light rays from near and far objects so that a
clear image on retina is formed
OPTIC NERVE: nerve fibres from rods and cones form a synapse with bipolar neuron.
This forms a synapse with optic neurons. Optic neurons join together to form the
optic nerve
Life Science Page 1
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