B5- Homeostasis & Response (PART ONE)

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  • Created by: ellamay.
  • Created on: 08-03-18 17:07
What is homeostasis?
The regulation of internal conditions of your body to maintain a stable internal environment for cell & enzyme function; in response to internal & external changes
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What is the role of negative feedback
To counteract change
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What does the CNS stand for?
Central Nervous System
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What does the CNS consist of?
The Spinal cord and the brain
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What is the role of a sensory neurone?
To carry electrical impulses from receptors to the CNS
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What is the role of a Motor neurone?
To carry electrical impulses from the CNS to the effectors
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What is the role of an effector?
To respond to electrical impules
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What are receptors?
Cells that detect stimuli
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What is a synapse?
The connection between two neurones
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Reflexes help prevent what
Injury
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Reflexes are...
fast & automatic
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Which is the correct order for a reflex arc?
Stimulus, Receptor, Sensory neurone, (synapse), relay neurone, cns, (synapse), motor neurone, effector
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What is the medulla?
the part of the brain responsible for things like breathing & heart rate
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What is the Cerebellum?
the part of the brain responsible for muscle coordination
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Which ways can be used to study the brain?
MRI scans, electrical stimulation, studying patients
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Why is it risky messing with the brain?
The brain is complex and delicate
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What is the sclera?
the tough, supporting wall of the eye
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What is the Iris?
The iris contains muscles that control the diameter of the pupil
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To look at near objects...
The ciliary muscles contract, the suspensory ligaments slacken, the lens becomes fat which increases the amount by which it refracts the light.
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To look at distant objects
The ciliary muscles relax, the suspensory ligaments tighten, the lens goes thin so light is refracted by a smaller amount
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What is the scientific name for long-sight?
hyperopia
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In long-sighted people, is light...
Refracted behind the retina
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The lens used to treat long-sightedness is called a?
Convex Lens
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How does the lens for long-sight correct the condition?
The lens curves outwards, which refracts the light rays so they focus on the retina
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Can short-sighted people focus on near objects?
Yes
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How does short-sight occur?
When the lens is the wrong shape and refracts the light too much
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What is laser eye surgery?
Surgery in which lasers vaporise tissue to change the shape of the cornea
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In laser eye surgery, to fix short-sight...
Doctors slim the cornea down making it less powerful
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Other cards in this set

Card 2

Front

What is the role of negative feedback

Back

To counteract change

Card 3

Front

What does the CNS stand for?

Back

Preview of the front of card 3

Card 4

Front

What does the CNS consist of?

Back

Preview of the front of card 4

Card 5

Front

What is the role of a sensory neurone?

Back

Preview of the front of card 5
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