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Biology
A Level

What's the difference between mitosis and meiosis?

Mitosis is the process somatic (normal body cells) use to divide. Two diploid (full set of chromosomes) daughter cells are produced from one diploid cell. In order for this to occur, the cell must replica...

TK
Answered by Tavishi K. Biology tutor
3413 Views

How does Cholera work?

Cholera works by releasing a toxin in the lumen. It causes chloride channels of the intestinal epithelial cells to open which in turn causes cholride ions to move along its concentration gradient into the...

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Answered by Tanvi K. Biology tutor
5382 Views

Describe the way in which the normal heart beat is initiated and controlled

The heart muscle is myogenic, which means that it can contract without any input from the nervous system. The stimulus for the muscle to contract originates from a group of specialised ca...

SS
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Some babies are born with a hole between the right and the left ventricles. These babies are unable to get enough oxygen to their tissues. Suggest why. (2)

A hole between the right and left ventricle means that blood would shunt from the left to the right ventricle as the pressure in the left ventricle is higher than in the right ventricle, leading to the mi...

SS
Answered by Sparsh S. Biology tutor
13848 Views

Sometimes, babies are born with a hole between the right and left ventricles of their heart. Why does this mean oxygenated blood cannot get around their bodies?

Higher pressure in the left ventricle (thicker wall, more contractile power) means that blood will cross from the left side of the heart to the right. This means that not as much oxygenated blood will be ...

IH
Answered by Isobel H. Biology tutor
3070 Views

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