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Explain why there is a change in the rate of blood flow through the digestive system during exercise.

During exercise, there is a higher need for the working muscle to have oxygen for respiration in order to generate energy to carry out its function. Therefore, there is more blood flow required to the muscle...
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Answered by Ashvin S. • Biology tutor
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Pathogens are disease-causing organisms which can infect humans. Bacteria and viruses are two examples of pathogens. Explain the differences between bacteria and pathogens and give an example of each.

Bacteria:Contain naked DNA Have a cell wall, membrane and organelles - RibosomesAre cells Larger than virusesCan survive without living hostCan be treated with antibiotics example: Staphylococcus aureus Viru...
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Answered by Tabitha G. • Biology tutor
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Why is scarlet fever, caused by Streptococcus bacteria, more common in children than adults?

Adults are exposed to the toxin as a child, which initiates an immune response. B lymphocytes are produced and release antibodies which bind to the specific toxin and destroy it as part of the humoural immun...
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Answered by Amelia D. • Biology tutor
3295 Views

Describe the process of speciation.

A population is split into two groups by some form of barrier, either physical, such as a mountain range, or behavioral, like looking for food at different times of day. This means that the two populations c...
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Answered by James M. • Biology tutor
4086 Views

How does vaccination make a person immune to a disease?

An inactive or weak form of the pathogen is introduced to the patient. This stimulates the production of lymphocytes which then produce antibodies against the antigen. Memory cells are also generated. If the...
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