Each type of ion has a specific role depending on its properties
Every inorganic ion does a particular job in the body. Its chemical properties — such as its charge or size — determine exactly what that job is.
Real World
Patients with iron-deficiency anaemia cannot carry enough oxygen because Fe²⁺ ions are missing from haemoglobin — doctors prescribe iron supplements specifically because no other ion can substitute for Fe²⁺ in that role.
Exam Focus
When asked to 'explain' an ion's role, always link its specific chemical property (charge, size) to its biological function.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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