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Response to Stimuli
AQA Unit 5 Biology
Frihah Parvaiz

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their of survival by to in their

Organisms increase their chance of
survival by responding to changes in
their external environment; eg by
avoiding hostile environments.

Tropisms as to directional stimuli that can maintain the
roots of flowering plants in a favourable


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Taxes and kineses as simple that can maintain a mobile in a favourable

Taxes- A simple response whose direction is determined by
the direction of the stimulus.

Earthworms will move away from light, this helps
them survive as it takes them into soil where they are
able to conserve food…

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A simple reflex arc three The
of in avoiding to the

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Control of heart The role of chemoreceptors and pressure receptors, the autonomic
rate nervous system and effectors in controlling heart rate.

Control of heart rate

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Stimulus Receptor Neurone and Neurone Effector Response
High Blood Baroreceptors- Impulses sent to medulla, Cardiac Heart rate slows
Pressure detect high blood which sends impulses Muscles down to reduce blood
pressure along parasympathetic pressure
neurones. These secrete
acetylcholine binding
with the receptors on
Low Blood Baroreceptors- Impulses sent…

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