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Homeostasis is the maintenance of a constant internal environment i) Explain how shivering helps to regulate body temperate. ii) Explain how sweating helps to regulate body temperature (4 marks)

i) Explain how shivering helps to regulate body temperature. Shivering stops body temperature from falling when the external environment is cold (1)Shivering increases muscle contraction (1) Heat is generate...
Answered by • Biology tutor
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What is the definition of diffusion

When molecules from an area of high concentration move to a place of lower concentration, down a concentration gradient, until evenly spread
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Answered by Pratyush P. • Biology tutor
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Cells divide within organisms using a process called mitosis. When sex cells (gametes) are formed, they undergo a different process called meiosis. Describe three key differences between the two processes. (3)

The key differences between mitosis and meiosis are:-Mitosis produces 2 daughter cells, where as meiosis produces 4 daughter cells. (1)-Mitosis produces genetically identical cells, where as meiosis produces...
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Answered by Hannah B. • Biology tutor
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Explain how an adult develops immunity to the toxin.

Adults can develop immunity to a toxin via being exposed to the toxin, whether this is by infection or vaccination. Since this toxin will be recognised as foreign by the body, this will stimulate an immune r...
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Answered by Sereena S. • Biology tutor
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Explain how blood vessels help to regulate a human's body temperature (3marks)

The blood vessels dilate and widen, which means that the blood flows closer to the surface of the skin, so more heat is able to be released, which cools the overall body temperature.
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Answered by Bill C. • Biology tutor
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