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Describe the process of ventilation in humans. (4 marks)

During inhalation, the intercostal muscles contract causing the rib cage to move up and out. The diaphragm also contracts and flattens. This causes the thorax to expand, increasing the volume and decreasing ...
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Answered by Ella C. • Biology tutor
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Compare type 1 and type 2 diabetes

Type 1 is insulin-dependent diabetes and is caused due to the underproduction of insulin, because the body attacks its own beta-cells which are needed to produce insulin (autoimmune disease). This means that...
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Answered by Maria E. • Biology tutor
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What are three factors that can affect the rate of photosynthesis?

Carbon dioxide levels, light and temperature
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Answered by Maria E. • Biology tutor
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Describe & Compare the differences in the structure & location of DNA & RNA

Although DNA and RNA belong to the same class of biological molecules, they have many differences in their structure and the location at which they are found. Firstly, RNA is a single polynucleotide chain wh...
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Answered by Alisha H. • Biology tutor
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Type 1 Diabetes is an autoimmune disease affecting the bodies ability to produce insulin. Describe how blood glucose is controlled in the body to a stable level, and how this would be affected in someone with type 1 diabetes.

Blood glucose is controlled via a negative feedback mechanism. High blood glucose is detected by B-cells of the Islets of Langerhans in the pancreas, and in response to this, these cells secrete insulin. Ins...
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Answered by William H. • Biology tutor
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