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What are two different ways cells of the body signal each other? Give an example of each.

Electrical signal, e.g. when you touch something hot, an electrical signal goes from your hand to your brain to tell you to pull your hand away. How do you know it's electrical? Because it's so fast! Chemica...
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Answered by Isobel H. • Biology tutor
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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 pus...
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Answered by Isobel H. • Biology tutor
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Describe the function of red blood cells and how they are suited to their function.

The primary function of red blood cells (RBCs) is to transport oxygen around the body. They contain haemoglobin, which oxygen attaches to in order to form oxyhaemoglobin. RBCs are very small in size and are ...
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Answered by Hafsa S. • Biology tutor
11849 Views

Describe the process of PCR, including what is needed.

Chemical components needed: a DNA template, DNA polymerase enzyme, primers, nucleotides and reaction buffer. Steps in PCR: Denaturation 96 degrees, to seperate DNA strands Annealing 55-65 degrees, cool so th...
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Answered by Kavi S. • Biology tutor
3674 Views

How does the heart work to pump blood around the body?

Firstly, I would ensure that the student understands the basics concepts of atrial systole, ventricular syotle and diastole and the pathway of the blood around the heart. Then I would further explain the con...
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Answered by Sophie C. • Biology tutor
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