20 Questions
What is the primary function of white blood cells in combating infectious and toxic agents?
Destroying invading bacteria or viruses by phagocytosis
Where are white blood cells formed in the body?
Partially in the bone marrow and partially in the lymph tissue
What is the role of antibodies and sensitized lymphocytes produced by white blood cells?
Destroying or inactivating the invading bacteria or viruses
What is the main function of tissue cells derived from leukocytes in preventing disease?
Working with white blood cells to prevent disease by destroying invaders or forming antibodies
Which type of white blood cell is responsible for ingesting invading organisms through phagocytosis?
Neutrophils
What is the normal percentage of monocytes in the total white blood cell count?
5.3%
Where are lymphocytes and plasma cells mainly produced?
Various lymphogenous tissues
What is the life span of lymphocytes in the body?
Weeks or months
Which enzyme in tears destroys certain bacteria in the eyes?
Lysozyme
What is the combined effect of pepsin and HCl in gastric juice?
Breaking down pathogens
What do lymphocytes and fibroblasts produce in response to viruses or tumor cells?
Interferons
What is the role of interferon released from virus-infected cells?
Inhibiting viral replication
Which enzyme catalyzes the reaction between H2O2 and chloride ions to form hypochlorite?
Peroxidase
What is the substance released by mast cells and basophils that can prevent blood coagulation?
Heparin
Which type of leukemia begins by cancerous production of young myelogenous cells in the bone marrow?
Acute myelogenous leukemia
What is the function of mechanical barriers in innate immunity?
Prevent the entry of pathogens
What is the main function of neutrophils and tissue macrophages?
Attacking and destroying bacteria, viruses, and other harmful agents
What is the process through which white blood cells enter the tissue spaces?
Diapedesis
What is the phenomenon known as when chemical substances in the tissues cause both neutrophils and macrophages to move toward the source of the chemical?
Chemotaxis
What happens once a foreign particle has been phagocytized by neutrophils or macrophages?
Lysosomes and other cytoplasmic granules release bactericidal agents to kill the particle
Test your knowledge about coronary circulation, blood flow in cardiac muscle, effects of the autonomic nervous system, regulation of cutaneous circulation, and muscle blood flow during rest and exercise.
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