Plasma
Plasma is the pale yellow liquid part of the blood, making up about 55% of its volume. It is about 90% water. Water is a good solvent and has a high specific heat capacity, which makes plasma well suited to transport.
Substances carried in solution in the plasma include:
• nutrients: glucose, amino acids, fatty acids and glycerol, vitamins
• mineral ions: sodium, potassium, chloride, calcium and hydrogencarbonate
• hormones, such as insulin and adrenaline, carried from endocrine glands to target cells
• waste products: urea from the liver to the kidneys, and most of the carbon dioxide, mainly as hydrogencarbonate ions
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More in Circulatory Systems
- Single Circulation System
- Double Circulation System
- Cardiovascular System
- Components of Blood
- Erythrocytes
- Leucocytes
- Granulocytes
- Agranulocytes
All 33 lessons in Circulatory Systems · All Edexcel AS-level Biology topics