Top answers

Biology
A Level

What is the structure of the human gas exchange system- how do we breathe in and out?

Named structures : trachea, bronchi, bronchioles, alveolinote: surface area increases as you go down levels, highest SA at alveoli
Breathing in : diaphragm contracts and exte...

Answered by Ankita S. Biology tutor
2111 Views

Explain the process of eutrophication.

Nitrates and phosphates are leached into a slow-moving water body (e.g. a lake). This results in an algal bloom on the surface of the water body. The algae block sunlight and prevent it from reaching aqua...

Answered by Vishal B. Biology tutor
2661 Views

How does atherosclerosis form?

Atherosclerosis occurs as a result of damage to the endothelial lining of blood vessels. Once the damage has occurred, the body induces an inflammatory response, causing ...

Answered by Daniella G. Biology tutor
2792 Views

Explain one way in which starch molecules are adapted to its function in plant cells

Starch molecules are insoluble and therefore don't affect the water potentialThey are also large and therefore can't leave the cellThey are compact and c...

Answered by Biology tutor
13346 Views

How does phagocytosis occur in macrophages?

A macrophage attaches to a pathogen by the receptors on the pathogen and macrophage binding. The pathogen is then engulfed and a phagosome forms, where a vesicle surrounds the pathogen. A lysosome moves t...

Answered by Hamza M. Biology tutor
1876 Views

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