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How do humans regulate their body temperature?

The hypothalamus in the brain controls the body temperature. If the temperature gets too high: receptors in the hypothalamus detect the change. the heat loss centre is stimulated causing 3 things: vasodialat...
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Answered by Ollie H. • Biology tutor
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What are the differences between fast and slow twitch skeletal muscle fibres?

We have two types of muscle in our body with each having different properties, functions and distributions in the human body. Fast twitch muscle fibres (also known as type II muscle fibres) are able to contr...
JB
Answered by Jack B. • Biology tutor
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Explain the formation of a new species

Speciation (the formation of a new species) can be broken down into a few concise steps. The most important step is the isolation of two populations. This usually occurs because of physical factors such as a...
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Answered by Aidan J. • Biology tutor
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How are chloroplasts adapted to their function?

Many grana, large surface area for photosynthetic pigments, electron carriers and ATP synthase enzymes. Photosynthetic pigments are arranged into structures called photosystems, allows maximum absorption of ...
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Answered by Matthew A. • Biology tutor
119467 Views

What is the all or nothing principle?

Basically this means that if the threshold voltage of a neurone is reached -40mV, then a stimulus will be generated of always +40mV. If the threshold is not reached then there will be no signal.
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Answered by Katie D. • Biology tutor
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