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Sight- how we see
Light enters our eye and is refracted by the
cornea and focused by the lens onto the
The lens which focuses is does this by a
process called accommodation and is
controlled by ten ciliary muscles and
suspensory ligament in the eye.
Accommodation isn't as affective in older
people as the lens has worn out.…read more

Slide 3

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Parts of the eye
Part Function
Cornea Refracts light
Iris Controls how much light enters the pupil
Lens Focuses light onto retina
Retina Contains light receptors(rods and cones)
Optic nerve Carries signals(impulses to the brain)
Binocular vision Monocular vision
Eyes are on the front of head Two eyes on the side of your head
Can judge distance You can see all around
Cannot see all the way around with out Cannot judge distances
moving head Useful for prey.
Useful for predators…read more

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Colour blindness is when the retina is missing or
contains defects of three cone cells that detect
red, green and blue light
It is and means you cannot see colour properly
Short sightedness is caused by the light rays
focusing before the retina due to the eyeball
being the wrong shape. Can be corrected by
surgery or concave lenses
Long sightedness is caused by the light
focusing after the retina and can be corrected
by convex lenses…read more

Slide 5

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The nervous system
Is made up of individual cells called neurons. Neurons are
long cells with most of the information being carried
along the axon(long bit)
Sensory neurones carry electrical information from the
sense to the CNS
Motor neurones carry information from the CNS to the
Some adaptations that make them good for there jobs
are their length so they can get to all parts of the body,
sheath to keep the impulse going the right way.
Have branched dendrite ends to help them connect with
many other cells.…read more

Slide 6

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Are the junction between two neurons where
information travels in chemicals called
The chemical binds itself with the receptor
molecules to cause a new impulse to form…read more

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