haem

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haem

A red blood cell contains haem to carry oxygen.

Definition
  1. Noun:
    • A complex red organic pigment containing iron and other atoms to which oxygen binds: Haem is the iron-containing component of haemoglobin, the protein in red blood cells that carries oxygen.
Usage
  • The word "haem" is a scientific term used primarily in biochemistry, physiology, and medicine. It refers to the specific non-protein, pigment part of larger molecules like haemoglobin and myoglobin.
Examples
  • Noun:
    • Oxygen binds reversibly to the iron atom within the haem group.
    • The characteristic red colour of blood is due to the presence of haem.
Advanced Usage
  • "Haem biosynthesis": Refers to the multi-step biochemical pathway by which haem is produced in the body.
    • Defects in haem biosynthesis can lead to diseases like porphyria.
  • "Haem iron": A specific form of dietary iron found in animal products, bound within the haem molecule.
    • Haem iron is more readily absorbed by the body than non-haem iron from plants.
Variants and Related Words
  • Heme (noun): The American English spelling of "haem".
    • The heme group is a porphyrin ring with a central iron ion.
  • Haemoglobin (noun): The oxygen-transporting protein in red blood cells, which contains four haem groups.
    • Haemoglobin levels are a common blood test.
  • Haematology (noun): The branch of medicine concerned with the study of blood, blood-forming organs, and blood diseases.
    • She is a specialist in haematology.
Synonyms
  • Heme: The direct synonym, differing only in regional spelling (AE vs. BE).
  • Iron protoporphyrin: A more technical chemical name for the haem molecule.
  • Ferroheme: A term specifying the reduced (ferrous, Fe²⁺) form of haem that binds oxygen.
Related Phrases and Compounds
  • Haem group: The standard term for the haem unit as part of a larger protein.
    • The enzyme cytochrome c contains a haem group essential for its function.
  • Haem oxygenase: An enzyme that breaks down haem.
    • Haem oxygenase activity produces biliverdin, carbon monoxide, and free iron.
haem

A red blood cell contains haem to carry oxygen.

Noun
  1. a complex red organic pigment containing iron and other atoms to which oxygen binds

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