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Describe the conducting circuit in the heart

The heart is a muscular pump which pushes blood out to the body. It does this by contracting the muscle fibres which sqeezes the blood out. The heart has 4 chambers. Blood comes into the top two chambers, ca...
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Answered by Clodagh M. • Biology tutor
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What are the main differences between prokaryotic and eukaryotic cells?

I would say the main difference here is that eukaryotic cells (e.g. animal cells) have a nucleus and membrane-bound organelles, whereas prokaryotic cells (bacteria and archaea) have no nucleus and no membran...
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Answered by Sophie P. • Biology tutor
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Explain why the activity of amylase rapidly decreases above pH 7.

pH 7 is the optimum pH for amylase. This means it performs best and has maximum activity at this pH. Above pH 7, the activity of amylase rapidly decreases beacuse the concentration of H+ ions (or protons) is...
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Answered by Emilia R. • Biology tutor
59605 Views

What might happen to the rate of glucose production as the temperature of a solution of sucrose and (human) sucrase was raised from 33°C to 43°C and why?

Sucrase is an enzyme that breaks sucrose down to its constituent monosaccharides – glucose and fructose. At 33°C the enzyme will not be working at its’ optimum, as it has evolved to work most efficiently at ...
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Answered by Miranda M. • Biology tutor
8356 Views

What is the difference between arteries, veins and capillaries?

Arteries, veins and capillaries are all types of blood vessels. The best way to think about their differences are the roles they play in circulation. So, if we take the systemic circulation as an example (th...
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Answered by Elizabeth H. • Biology tutor
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