Top answers

What happens when a muscle contracts?

Looking at a diagram of muscle cells you can identify: Z lines, H zone, I band, and A band. The Z lines move closer together, H zone becomes more narrow, as does the I band, and the A band remains the same w...
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Answered by Emily M. • Biology tutor
3723 Views

How is ATP produced in the mitochondria?

The Krebs cycle produces ATP by substrate level phosphorylation. The cycle is completed twice per glucose molecule. It also produces NADH which goes on to donate an electron to the electron transport chain o...
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Answered by Emily M. • Biology tutor
24450 Views

How do I structure a good RS essay?

Have an argument with yourself is probably the best advice i could give. Choose an initial point of view that answers the question at hand and include this view within your introduction along with any explan...
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12704 Views

Solve 3(x-2)=21

Firstly, I would explain to the student what exactly the question is asking you to do. When solving an equation we are finding the value of x. I would get the student to read the equation aloud, starting fro...
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Answered by Imogen N. • Maths tutor
14823 Views

Define the terms CU and ALU and briefly explain their roles in the CPU.

The two terms are acronyms for "Control Unit" and "Arithmetic and Logic Unit". The ALU handles all arithmetic operations (for example, addition) and all logical operations (for example, c...
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Answered by João D. • Computing tutor
10779 Views