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What is homeostasis?

Homeostasis can be defined as the maintenance of a constant internal environment despite various stresses in the external environment which may act to alter this stable state. The stable state that the body ...
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Answered by Emma B. • Biology tutor
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When is Chi-squared the most appropriate statistical test to use?

Chi-squared is about establishing whether the difference in results between groups is likely to be due to chance, or due to some genuine difference in the groups' properties. It aims to answer the question, ...
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Answered by Anastasia P. • Biology tutor
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How do I test for the presence of starch in food?

The iodine test - use a dropper to apply a little iodine onto a small sample of the food. If starch is present, the iodine will change colour from orange/brown to blue/black.
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Answered by Anastasia P. • Biology tutor
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Describe the events that occur leading to an action potential, and briefly explain why it is described as "all or nothing"?

Across the membrane of a neuron, the membrane potential at rest is approximately -70mV. When a stimulus of some kind is detected by sensory receptors (for example the nociceptors on the skin surface which de...
BA
Answered by Bilaal A. • Biology tutor
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Describe the series of events leading to atherosclerosis.

Atherosclerosis is a cardiovascular disease where fatty, cholesterol filled plaque builds up in the arteries, it is the main contributor to coronary artery disease. These plaques narrow the vessel and obstru...
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Answered by Charlotte M. • Biology tutor
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