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Define antibodies and antigens, and describe the different ways in which the body develops immunity.

Immunity is the capacity of the body to recognise the intrusion of disease-causing microorganisms (pathogens) and develop a response to fight infection. Antigens and antibodies are crucial to the process of ...
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Answered by Charlotte B. • Biology tutor
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Explain the ways in which the structure of alveoli is related to its function

The alveolar epithelium is a site of rapid diffusion, consequently it is very thin, only one cell thick, providing a short diffusion pathway.Alveoli have constant blood flow and ventilation, maintaining a st...
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Answered by Joanne M. • Biology tutor
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Explain Cohesion-Tension Theory

Transpiration of water through stomata creates low potential at the top of the xylem. Water molecules stick together via hydrogen bonds in a process known as COHESION . This occurs because water molecules ar...
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Answered by Joanne M. • Biology tutor
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Explain what happens when an impulse arrvies at a junction between two neurones

At each junction there is a neurone that comes before it called the presynaptic neurone and one that comes after called the post synaptic neurone and the space between the two neurones is called the synapse....
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Answered by amy b. • Biology tutor
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Describe how the coronary arteries can become narrowed and explain how this can lead to a heart attack.

Eating a diet high in saturated fat has been linked to high levels of cholesterol in the blood.If there is too much cholesterol in the blood it can start to build up in the coronary arteries. This causes pla...
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