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How are arteries adapted to carry blood away from the heart?

Since arteries need to pump blood to the entire body under high pressure, they are very strong with thick muscular walls. Artery walls are also elastic, which allows them to stretch and spring back in order ...
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Answered by Maxwell C. • Biology tutor
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What is the difference between a gene and a chromosome?

DNA is a long list of instructions which everyone has inside the nucleus of each of their cells. A section of DNA that has instructions to make a certain protein is called a gene . Now because DNA is so long...
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Answered by Saheefa I. • Biology tutor
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What are lipoproteins and what is their function?

Lipoproteins are proteins that transport hydrophobic lipids in water based (polar) solutions such as blood. The two main types you need to know about for the IB biology course as part of option D includes HD...
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Answered by Hannah L. • Biology tutor
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Describe the flow of blood in the heart

Blood from the body enters the right atrium of the heart via the vena cava. It then travels into the right ventricle by a combination of gravity and contraction of the right atrium. After the right atrium ha...
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Answered by Emily R. • Biology tutor
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What role do calcium ions play in contraction of the sarcomere? (4 marks)

When an action potential arrives at the motor end plate it causes depolarisation to occur in the sarcolemma of the effector muscle cells.2) Depolarisation spreads via T-tubules to the sarcoplasmic reticulum ...
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Answered by Ben W. • Biology tutor
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