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B7: Blood and the Circulatory System
- Blood - Cells, Platelets and Plasma
- Red Blood Cells
- Transports oxygen from the lungs to the rest of
the body.
- There is no nucleus so that they can be filled with
haemoglobin, the substance that binds with oxygen.
- They have a biconcave shape, giving them a large surface
area for the exchange of oxygen.
- There is no nucleus so that they can be filled with
haemoglobin, the substance that binds with oxygen.
- Transports oxygen from the lungs to the rest of
the body.
- Plasma
- The liquid that carries nutrients (e.g. glucose and amino acids),
antibodies, hormones and waste (e.g. carbon dioxide and urea).
- The liquid that carries nutrients (e.g. glucose and amino acids),
antibodies, hormones and waste (e.g. carbon dioxide and urea).
- Platelets
- Small fragments of cells that help the blood to clot
at the site of a wound
- Small fragments of cells that help the blood to clot
at the site of a wound
- White Blood Cells
- Help to fight infection by protecting the body
against attack from microorganisms
- Help to fight infection by protecting the body
against attack from microorganisms
- Red Blood Cells
- The Circulatory System
- Humans have a double circulatory system - two
circuits joined together.
- The first circuit pumps deoxygenated blood to the lungs, to
take in oxygen. The blood then returns to the heart.
- The second circuit pumps oxygenated blood around the body. The blood gives up it's oxygen at the body
cells and the deoxygenated blood returns to the heart to be pumped around the first circuit.
- The first circuit pumps deoxygenated blood to the lungs, to
take in oxygen. The blood then returns to the heart.
- Humans have a double circulatory system - two
circuits joined together.
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