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Group 4: Describe the process of blood clotting. Then outline how phagocytic leukocytes ingest pathogens in the blood and body tissues.

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· When the phagocytes meet the pathogens, they ingest the organisms by phagocytosis (eating). Once they are in the phagocytes, the pathogens go into the vesicles which fuse with the lysosomes, which then release hydrolytic enzymes on them and destroy them. · Phagocytosis: The process of enveloping either food or unknown pathogens (as in the case of white blood cells). Occurs in phagocytes (for example, white blood cells). There are two types of phagocytes: “professional” and “non professional.” Professional phagocytes have receptors on their membranes which can detect harmful bacteria or dead cells to be ingested. Professional phagocytes include macrophages and granulocytes. · Leukocytes are also known as white blood cells. They fight off foreign agents. The number increases in the presence of infection, which means a decrease in normal blood cells. The average person has 5,000 to 10,000 white blood cells in their system at a time. People with aids have a dramatic decrease in the number of white blood cells. · Hydrolytic enzymes are in the digestive lysosomes. Hydrolysis: the breaking off of hydrogen.