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Option D: Human physiology

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Overview of the essential ideas for this option.

D.1: A balanced diet is essential to human health.

D.2: Digestion is controlled by nervous and hormonal mechanisms.

D.3: The chemical composition of the blood is regulated by the

D.4:  Internal and external factors influence heart function.

D.5: Hormones are not secreted at a uniform rate and exert their effect at low concentrations.

D.6: Red blood cells are vital in the transport of respiratory gases.


Directly related questions


Sub sections and their related questions

Option D: Human physiology (Core topics)

Option D: Human physiology (Additional higher level topics)