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What role does the heart play in the circulation of blood around the body?

The heart is essential and plays a vital role in the distribution of blood around the body. The circulation system is comprised of two organs: heart and lung. The heart has vessels bringing blood into it fro...
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Answered by Rohan G. • Biology tutor
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Explain osmosis and explain why this is an important concept in maintaining water potential in animal cells.

Osmosis is a passive process by which water achieves equilibrium through a semi-permeable membrane, moving down a concentration gradient. Water will move from where it is in high concentration (ie in a low s...
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Answered by Alana P. • Biology tutor
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Why would the mass of a piece of potato change when it is placed in different sugar solutions?

It's all due to a process called osmosis and the movement of water from a high water potential to a place of low water potential, passing through a partially permeable membrane. So what does this mean? If yo...
JG
Answered by Joanna G. • Biology tutor
81387 Views

How is the structure of a capillary related to its function?

The capillaries are very small blood vessels in the body that take the blood to the individual body cells. They transport oxygen and nutrients to the cells ( the cell needs these to survive) and remove carbo...
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Answered by Charlotte C. • Biology tutor
30425 Views

How does a chemical synapse transmit an action potential?

The action potential reaches the pre-synaptic knob causing depolarisation. This causes voltage-gated calcium channels in the pre-synaptic membrane to open. Calcium ions enter the pre-synaptic knob through th...
KB
Answered by Kathryn B. • Biology tutor
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