BIOL - Composition of Blood 

Question: 2.57 Describe the composition of the blood, red blood cells, white blood cells, platelets and plasma 

Question: 2.58 understand the role of plasma in the transport of CO2, digestion,food, urea, hormones and heat energy 

Includes:

• Red blood cells
• White blood cells
• Platelets
• Plasma

Red Blood cell: Transports O₂

White blood cell: Ingests pathogens and produces antibodies

Platelets: Majorly involved in blood clotting

Plasma: Transports CO2, digest food, hormones and heat

*Plasma is a straw-coloured liquid that makes up just over half the volume of blood*

Further explanation of Plasma:

• Plasma is mainly composed of water and the water properties that makes it import is that it is a solvent and a fluid. 
• The transportation of CO2 gets carried out in the plasma dissolved in a form of hydrogen carbonate ions and CO2
• Digested food takes the form of soluble sugars and amino acids, which can be transported to the cells through the plasma.
• Waste molecules such as Urea involved in excretion, are also transported from the liver to the kidney dissolved in the plasma of blood. 
• In communication terms, blood carries signals from the body through hormones such as ADH, Insulin and Glucagons.
• Another property of water is that it excels at carrying heat so becomes important in maintaining body temperature.

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