Transport Systems In Animals
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What does blood contaion
Blood contains plasma, red blood cells and white blood cells
What does blood transport
It transports nutrients, oxygen and carbon dioxide.
Red blood cells features
Red blood cells contain no nucleus Red blood cells are biconcave in shape Red blood cells contain the protein haemoglobin
What does haemoglobin do
Oxygen is transported by haemoglobin in the form of oxyhaemoglobin. Oxygen + Haemoglobin → Oxyhaemoglobin This is reversible
What is pathogen
Pathogens are disease-causing micro-organisms (bacteria, viruses and fungi).
White bloodcell types
The two types of white blood cells are: Lymphocytes Phagocytes
Phagocytosis
phagocytes will detect , surround ,engulf and digest any pathogen that is encountered
Lymphocytes
lymphocytes produce antibodies which destroy pathogens. Each antibody is specific to a particular pathogen
How do lymphocytes find the specific antibodies
Lymphocytes recognise proteins on the surface of pathogens called antigens. Antibodies match the shape of the antigen - they are specific
Coronary artery
The heart is supplied with blood from the coronary artery