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Explain how a leaky heart valve can cause health issues

A leaky heart valve is called valve regurgitation and is caused by the valves not completely closing. Any valve in the heart can have a regurgitation whether that is the aortic, mitral, pulmonary or the tric...
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Answered by Vishnu S. • Biology tutor
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Describe the Control of Blood Sugar Concentration in the body under normal physiological conditions (4 Marks)

Blood glucose concentration is monitored and controlled by the pancreas (1 Mark)If blood glucose is too high then the Pancreas produces the hormone Insulin (1 Mark)From beta cells (1 Mark)This results in glu...
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Answered by Thomas C. • Biology tutor
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Describe how animals and plants are adapted to survive in dry conditions such as deserts:

Plants are adapted to survive dry conditions in the following ways: A decrease in surface area of the leaf, such as that found in the rolled-up leaf/spike in cactuses. This decreases the area from which wate...
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Answered by Aya O. • Biology tutor
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How do vaccines protect us from infection and why is it important that lots of people are vaccinated?

Vaccines contain a safe form(weakened or small sample, a dead sample) of a disease causing micro-organism.The white blood cells produce the antibodies to destroy the invading pathogen.The memory cells can th...
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Answered by shreyas a. • Biology tutor
2650 Views

Describe how insulin returns the blood glucose concentration to normal.

Insulin acts a key to open the way for glucose to enter cells (hepatocytes, muscles and brain cells)Hepatocytes absorbs more glucose from blood. Glucose converted to glycogen- for storageLiver cells respire ...
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Answered by Emma K. • Biology tutor
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