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Explain how blood is pumped around the body

Oxygenated blood flows into the left atrium from the lungs via the pulmonary vein, when the left atrium contracts the blood flows down into the left ventricle via the mitral valve (which divides the atrium f...
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Answered by Raechel P. • Biology tutor
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Describe how different environmental factors affect: the direction of growth of roots the direction of growth of shoots. In your answer you should refer to the role of plant hormones.

Here a thoroughly thought out response to the question should be formulated it is not enough to simply know the name and role of plant hormones within it. Start with a factor, it is helpful to know terminolo...
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When playing football, a footballer's body temperature increases. Explain how the brain monitors body temperature

After reading this question we know that exercise causes body temperature to rise. The question is asking how the brain monitors body temperature, with the key words being 'explain' and ' how' . The question...
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Answered by Natalia A. • Biology tutor
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What are the four levels of protein structure? Please name and describe each level.

Primary - where amino acids are in the correct order in the polypeptide chain. Secondary - where small structures within the chain begin to form (including alpha helices and beta pleated sheets). Tertiary - ...
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Answered by Leah Y. • Biology tutor
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What is the difference between secondary and tertiary protein structure?

Secondary: localised folding within the polypeptide chain that is stabilised by hydrogen bonds. The most common secondary protein structures are alpha helices and beta sheets. Tertiary: this is the final for...
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Answered by Emma W. • Biology tutor
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