Leukocytes White Blood Cells Leukocytes WBC have nuclei
Leukocytes White Blood Cells
Leukocytes - WBC • have nuclei and usual organelles • amoeboid motion
• capable of slipping in and out of blood vessels
• respond to chemicals released by injured cells and other WBC’s • body is able to double normal # of WBC’s in a few hours in response to infection
Types of WBC’s
Granulocytes • lobed nuclei • cytoplasmic granules
1. Neutrophils • most numerous • are phagocytes partial to bacteria and fungus during acute infection
2. Basophiles • least numerous • release chemicals that help migration of other WBC’s to site
3. Eosinophils • • increase numbers due to parasites, protozoans, and allergies phagocytes and release chemicals that counteract allergic reaction
Agranulocytes • after being formed in bone marrow they migrate to lymph tissue and reproduce furthere
1. Lymphocytes • most in lymph tissue § T cells act on viruses and tumors § B cells form plasma cells which make antibodies
2. Monocytes • phagocytes § macrophages
• Like RBC’s. , WBC’s form from hemocytoblasts § The cells that form agranulocytes migrate to lymph tissues § The granulocytes form in bone marrow
Leukemia “white blood”
Leukemia “white blood” • group of WBC cancers • WBC’s are overproduced, unspecialized, and suppress normal bone marrow production
• may be chronic (usually adults) or acute (children) • treated with: § Radiation § Chemotherapy § Bone marrow transplants
Mononucleosis
Mononucleosis • • highly contagious virus usually in children and young adults no cure - usually lasts a few weeks large amounts of abnormal monocytes and lymphocytes
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