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Describe and explain how a signal is transmitted between neurones.

Action potential arrives down the first neurone. The action potential is a changing potential as a result of ion channels opening along the walls of the neurone, with Na+ moving in down the electrochemical g...
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Answered by Shashvat V. • Biology tutor
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Give one reason as to why is it important that Carbon dioxide (CO2) is removed from the blood ?

In the blood, the enzyme carbonic anhydrase allows water and CO2 to combine to form hydrogen carbonate ions and hydrogen ions. In the presence of many hydrogen ions, oxygen has a weaker affinity for haemoglo...
NO
Answered by Novella O. • Biology tutor
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Describe the process of ventilation

Inspiration: -Diaphragm muscles contract, pulling the diaphragm downwards-External intercostal muscles contract pulling ribs upwards and outwards-Thoracic cavity increases in volume, causing pressure in lung...
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Answered by Izabelle L. • Biology tutor
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Explain the role of B-lymphocytes and T-lymphocytes in the defence of the body against a virus infection

B-lymphocytes are involved in the humoral response and produce antibodies specific to the antigen. The antibodies bind to antigens and causes the virus to clump together/ agglutinate. T-lymphocytes are invol...
Answered by • Biology tutor
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What is the structure of the human gas exchange system- how do we breathe in and out?

Named structures : trachea, bronchi, bronchioles, alveolinote: surface area increases as you go down levels, highest SA at alveoli Breathing in : diaphragm contracts and external intercostal muscles contract...
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Answered by Ankita S. • Biology tutor
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