14 terms

IGCSE Biology - Blood

Key topics from Edexcel IGCSE Biology on the topic of Blood
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Blood
Fluid composed of red and white blood cells, plasma and platelets
Plasma
Carries blood cells, dissolved nutrients, hormones, carbon dioxide and urea around the body. It also distributes heat around the body.
Red blood cells (Erythrocytes)
Highly specialised cells made in the bone marrow that transport oxygen around the body
White blood cells
Main function is to protect the body against invasion by pathogens
Platelets
Cell fragments present in blood that release chemicals to make blood clot when we cut ourselves
Pathogen
Disease-causing microorganism such as bacteria and viruses
Lymphocytes
A type of white blood cell that produces antibodies to destroy microorganisms
Phagocytes
A type of white blood cell that engulfs bacteria and other microorganisms that have infected our bodies
Phagocytosis
The engulfing and ingestion of microorganisms by phagocytes
Pseudopodia
Cytoplasmic extensions produced by phagocytes used to surround and enclose microorganisms
Haemoglobin
An iron-containing protein present in red blood cells that combines with oxygen to form oxyhaemoglobin. It's function is to transport oxygen around the body.
Antibody
A soluble protein produced by lymphocytes that are secreted into blood plasma in response to an antigen
Antigen
A chemical marker present on the surface of pathogens that are recognised by antibodies and illicit an immune response in the body
Vaccination
A biological preparation that gives artificial immunity to a disease without contracting the disease itself
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