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The Brain, the Eye and Thermoregulation - Coggle Diagram
The Brain, the Eye and Thermoregulation
The Brain
The spinal cord and brain make up the cns, which is made up of billions of neurones.
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The Eye
The parts of the eye
The sclera is the tough, supporting wall of the eye
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The iris contains muscles that allow it to control the diameter of the pupil so therefore controls how much light can enter the eye
The lens focuses the light onto the retina (which contains receptor cells sensitive to light intensity and colour)
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The Iris Reflex
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When light receptors detect a very bright light, a reflex is triggered that makes the pupil smaller
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How to look at near objects:
The ciliary muscles contract which slackens the suspendory muscles
The lens becomes fat
This increases the amount by which it refracts
Some people are longsighted, so they are unable to focus on near objects. This occurs when the lens is the wrong shape and doesn't recfract enough light or when the eyeball is too short. The images of near objects are brought into focus behind the retina.
How to look at distant objects: The ciliary muscles relax, which allows the suspendory ligaments to pull tight. This makes the lens go thin. So it refracts light by a smaller amount.
Some people are shortsighted, so they are unable to focus on distant objects. This occurs when the lens is the wrong shape and refracts the light too much or the eyeball is too long. The images of distant objects are brought into focus in front of the retina.