A2 Biology Unit 1

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  • Created by: Amy
  • Created on: 13-06-13 14:42
A Stimulus
is any change in the environment that causes a response.
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A Response
Is a change in behaviour or physiology as a result of a change in the environment
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Homeostasis
Is the maintenance of the internal environment in a constant state despite external changes
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Negative feedback
Is the process that brings about a reversal of any change in conditions. It ensures that an optimum steady state can be maintained, as the internal environment is returned to its original set of conditions after any change.
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Positive feedback
is a oricess that increases any change detected by the receptors. it tends to be harmful and does not lead to homeostasis
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An Ectotherm
is an organism that relies on external source of heat to regulate its body temperature
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An Endotherm
is an organism that can use internal sources of heat, such as heat generated from metabolism in the liver, maintain its body temperature
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A Generator potential
Is a small depolarisation caused by sodium ions entering the cell
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Action Potential
is achieved when the membrane is depolarised to a value of about +40 mV. it is an all-or-nothing response.
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The Resting Potential
Is the potential difference of the voltage across the neurone cell membrane while the neurone is at rest. it is about -60 mV inside the cell compaired with the outside. other cells may also maintain a resting potential that might change under curtain
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Local Currents
are the movements of ions along the neurone. the flow of the ions is caused by the increase in concentration at one point, which causes diffusion away from the region of highter concentration
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Card 2

Front

Is a change in behaviour or physiology as a result of a change in the environment

Back

A Response

Card 3

Front

Is the maintenance of the internal environment in a constant state despite external changes

Back

Preview of the back of card 3

Card 4

Front

Is the process that brings about a reversal of any change in conditions. It ensures that an optimum steady state can be maintained, as the internal environment is returned to its original set of conditions after any change.

Back

Preview of the back of card 4

Card 5

Front

is a oricess that increases any change detected by the receptors. it tends to be harmful and does not lead to homeostasis

Back

Preview of the back of card 5
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