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F214 Module 1: Communication and Homeostasis
4.1.1 Communication

(a) outline the need for communication systems within multicellular organisms, with reference to the need
to respond to changes in the internal and external environment and to coordinate the activities of
different organs

All living things to maintain a certain limited set…

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F214 Module 1: Communication and Homeostasis

(d) define the terms negative feedback, positive feedback and homeostasis
(e) explain the principles of homeostasis in terms of receptors, effectors and negative feedback

Negative feedback ­ a process that brings about the reversal of any change in conditions. It ensures that an

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F214 Module 1: Communication and Homeostasis
Homeostasis ­ the maintenance the internal environment in a constant state despite external changes, so
enzymes can work at an optimum .

(f) describe the physiological and behavioural responses that maintain a constant core body temperature in
endotherms and endotherms, with reference to peripheral…

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F214 Module 1: Communication and Homeostasis

Ectotherms Endotherms
Physiologic A lizard with frills can absorb more heat. Sweating water in sweat evaporates ,
al The horned lizard can alter its surface using heat from blood to supply latent heat
area by expanding or contracting its rib of vaporisation .


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