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Why is the human circulatory system a double system?

The human circulatory system consists of the heart - a pump and a series of tubes - the blood vessels containing the blood. There is an atrium and a ventricle on each side of the heart and the two sides can ...
YZ
Answered by Yuhui Z. • Biology tutor
4906 Views

Why should we not overprescribe and overuse antibiotics?

Antibiotics are used for killing bacteria and therefore, it can act as a selection pressure. This means that the bacteria can mutate, in order to avoid being killed and this would be a favourable mutation, a...
NR
Answered by Niva R. • Biology tutor
3599 Views

Mutations leads to the production of a non-functional protein. Explain why.

Mutations changes triplets/codons after that point and causes a frame shift Changes amino acid sequence after this as it codes for different amino acids Affects hydrogen/ionic/sulfur bonds but not peptide bo...
CH
Answered by Carmen H. • Biology tutor
15615 Views

A myelinated axon conducts impulses faster than a non-myelinated axon.

In myelinated axons, there is action potential/depolarisation only at the nodes. In myelinated axons, the nerve impulses jump from node to node, therefore there is saltatory conduction. In myelinated axons, ...
CH
Answered by Carmen H. • Biology tutor
6059 Views

Some babies are born with a hole between the right and the left ventricles. These babies are unable to get enough oxygen to their tissues. Suggest why.

This question is an example of the 'suggest' questions that are asked. 'The hole is due to the failure of the foramen ovale to close. As a result, oxygenated blood from the left ventricle mixes with deoxygen...
LH
Answered by Lamis H. • Biology tutor
11437 Views