A-Level Biology AQA Notes

3.1.8 Inorganic ions

Inorganic Ions
  • Inorganic ions are atoms or molecules with an electric charge, containing no carbon.
  • Cations are positively charged ions
  • Anions are negatively charged ions
  • Inorganic ions occur in solution in the cytoplasm and body fluids of organisms, some in high concentrations and others in very low concentrations
  • Each type of ion has a specific role, depending on its properties
    • Hydrogen ions determine the pH of bodily fluids. The higher the concentration, the lower the pH
    • Iron ions are essential components of the prosthetic group in haemoglobin and bind to oxygen
    • Sodium ions are used in the co-transport of glucose and amino acids across cell membranes
    • Phosphate ions are essential components of DNA, RNA & ATP