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MB.1.4. Optimum metabolic efficiency (HSC biology)





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Uploaded on Jan 10, 2012

Covers the HSC biology syllabus dot point: "explain why the maintenance of a constant internal environment is important for optimal metabolic efficiency"

• These processes describe methods by which the body is able to regulate its internal environment and metabolic functions such that an internal environment is kept constant regardless of changes in the external environment
• Affect on enzymes
- Optimum - Functionality at proper rate (fast and efficient)
- Non-optimum conditions -- enzymes become denatured, thus speed and occurrence of reaction is inhibited
• If sub-optimal conditions are present, this will affect the functional units of metabolism (enzymes), which in turn will inhibit vital metabolic reactions such as respiration due to denaturation.
• Without a constant internal environment one must expect metabolic degradation (slower) an consequential death of an organism if more changes i.e. (pH, temperature)
• Draw enzyme activity versus temperature/pH graph
• Ideal condition depends on the organism & enzyme
• SUMMARY: if we are at sub-optimal conditions our enzymes and therefore metabolic reactions will not work as fast or as efficiently as at optimum. If these enzymes work slower our body cells cannot sustain themselves and thus we will die.

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