Top answers

What is a pathogen?

An organism that causes disease e.g. bacteria, virus
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Answered by Erin W. • Biology tutor
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Why does an increased heart rate during exercise help muscles contract?

An increased heart rate will cause an increase in blood flow around the body (increased cardiac output). This means that there will be more oxygen and more glucose being supplied to the muscles. Since oxygen...
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Answered by Adam D. • Biology tutor
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How is the concentration of sodium altered in a cell in the intestines and why is glucose absorption affected?

Imagine a cell like a rectangle, of which one side has finger-like projections (this side faces the intestinal lumen) called the villi, and the other side is flat - the base membrane of that cell that is. On...
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Answered by Antonis T. • Biology tutor
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Upon perfroming vigorous excercise, an athlete's blood glucose begins to decrease. Describe how the body responds when blood glucose concentration begins to decrease.

pancreas detects low blood glucose, so produces glucagon. glycogen is converted to glucose
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Answered by Holly V. • Biology tutor
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Can you explain the process of DNA transcription?

The first stage of gene expression is DNA transcription. Transcription is the formation of single stranded mRNA from double stranded DNA. During transcription, the enzyme DNA helicase unwinds the double heli...
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Answered by Ashley M. • Biology tutor
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