What is a red blood cell?

a red blood cellA red blood cell is described as a biconcave disc - a disc that has been pushed in on both sides. They are around 7 to 8 micrometers wide. In 1 millilitre of blood there are typically around 5 billion red blood cells reference.

Each red blood cell contains several hundred million molecules of haemoglobin see note.

Image of red blood cells from Wikimedia commons link

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page last modified 19/11/2007
Pulse oximetry

Oxygen transport
 External respiration
 Red blood cells
 Oxygen saturation
 Oxygen delivery
 Internal respiration

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