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In terms of pressure and volume, explain the changes that take place in the chest to allow ventilation to occur.

Think through inhalation and exhalation separately and the events step-wise. Be aware of the movements of your own chest when breathing in and out. Inhalation (breathing in):The external intercostal muscles ...
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Answered by Alice H. • Biology tutor
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Describe the role of different structures (shown in the figure below) involved in the coordination of a reflex action and the sequence of events that occur(6 marks).

A receptor detects a stimulus and generates electrical impulses in response. Electrical signals are then conducted by a sensory neuron to the spinal cord. Neurotransmitter molecules then cross the synapse be...
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Answered by Laura S. • Biology tutor
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What is the difference between mitosis and meiosis?

The main difference between the two types of cell divisions is that the purpose of mitosis is for cell growth and the purpose for meiosis is for sexual differentiation/reproduction. Mitosis occurs in somatic...
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Answered by Charlotte S. • Biology tutor
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Describe the structure of proteins

A protein is composed of polymers of amino acids , joined together by peptide bonds via condensation .A primary structure is the order of amino acidsA secondary structure is the folding of polypeptide bonds ...
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Answered by Annabel L. • Biology tutor
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Describe how negative feedback is used to control blood glucose concentration

Blood glucose concentration levels fluctuates depending on what has been eaten and how much activity has been done. alpha and beta (B) cells in the pancreas detect change in the blood glucose concentration. ...
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Answered by Catherine W. • Biology tutor
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