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Describe and explain two ways in which alveoli in the mammalian lung are adapted for efficient gaseous exchange

Alveoli in the mammalian lung are thin walled to allow the quick passage of gases, for example oxygen and carbon dioxide. Alveoli in the mammalian lung have a large surface area which allows for the diffusio...
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Answered by Guy A. • Biology tutor
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What are the different types of neurones in the body?

A neurone is a special type of cell in the body which transmits electrical impulses. Neurones can be classified into different types based on the information they receive and pass on. The 3 main types of neu...
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Answered by Phoebe C. • Biology tutor
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Explain the role of plant hormones in plant shoot and root growth

Auxins are degraded within the tips of the shoots of the plant exposed to sunlight, and gather on the shaded side of the shoots. Gathered auxins enourage cell elongation, and the shoot to grow upwards, towar...
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Answered by Edward L. • Biology tutor
7934 Views

Explain how DNA is replicated and why this is important in biology.

When cells divide by cytokinesis the nucleus also has to divide so that each new cell contains a nucleus with a complete copy of all of the genetic information. DNA replication therefore needs to ensure that...
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Answered by Danya S. • Biology tutor
14087 Views

How does the wave of conduction pass through the heart?

Firstly, the 'wave of excitation' is produced by the sinoatrial node (SAN) in the top of the right atrium - this is also known as the pacemaker, as this is what controls the rate of contractions. This wave p...
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Answered by Elisabeth B. • Biology tutor
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