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Explain the process and mechanisms underpinning gas exchange in animal bodies.

The process responsible for gas exchange in animals is diffusion. Air, containing oxygen needed for cellular respiration, is inspired in fills the lungs. The high concentration of oxygen in the lung creates ...
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Answered by Eoin B. • Biology tutor
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Name the enzyme present in the saliva and what is its role in digestion

Saliva contains salivary amylase which digest some carbohydrates in mouth
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Answered by Sonali M. • Biology tutor
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Describe the various functions of proteins in our body.

Enzymes : Enzymes are biological catalysts, meaning they speed up the rate of the reaction without being used up. An example of an enzyme is amylase, which is produced by the salivary glands and is involved ...
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Answered by Ayesha A. • Biology tutor
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What is the role of white blood cells in the immune system?

White blood cells can have different roles and are important for protecting the body against pathogens. They can inges t a pathogen and destroy it, some produce antitoxins which destroy the toxins produced b...
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Answered by Anna W. • Biology tutor
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Symptoms of Salmonella include vomiting and diarrhoea, and it is known this is caused by a bacterium. What does the bacterium do to cause such symptoms?

Bacteria release toxins to poison and damage cells, leading to symptoms like vomiting and diarrhoea.
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Answered by Ishan J. • Biology tutor
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