Blood

Components

• Red blood cells: transports oxygen through its combination with the protein haemoglobin.
• White blood cells: phagocytosis and antibody production.
• Platelets: conversion of fibrinogen to fibrin to form a mesh - clotting the blood. This prevents blood loss and the entry of pathogens.
• Plasma: the transport of blood cells, ions, soluble nutrients, hormones, and carbon dioxide.
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Phagocytes

• PHAGOCYTOSIS
• Pathogen is ingested.
• Pathogen is taken to food vacuoles.
• Digestion occurs by using enzymes, which kills the pathogen.
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Lymphocytes

• Make proteins called antibodies that attack foreign bodies.
• They agglutinate the pathogens and dissolve their cell membranes.
• They also neutralize the toxins that some pathogens produce.