ama 180 anatomy physiology medical terminology pathology 11 blood lymphatic system l.
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AMA 180 - Anatomy & Physiology/Medical Terminology/Pathology 11 Blood & Lymphatic System

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AMA 180 - Anatomy & Physiology/Medical Terminology/Pathology 11 Blood & Lymphatic System. Function of the Blood:. Maintains a constant environment for living tissues in the body. Transports nutrients, gases (e.g. oxygen and carbon dioxide) and wastes to and from the cells.

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function of the blood
Function of the Blood:
  • Maintains a constant environment for living tissues in the body.
  • Transports nutrients, gases (e.g. oxygen and carbon dioxide) and wastes to and from the cells.
  • Transports hormones from glands to distant sites to regulate growth, reproduction and energy production.
  • Contains proteins, white blood cells and antibodies to fight infection, and platelets (thrombocytes) to help with clotting.
composition and formation of blood
Composition and Formation of Blood:
  • Cells: formed elements; blood cells originate in the bone marrow (hematopoietic stem cells) and change size and shape to become specialized (differentiated).
  • Plasma: liquid portion of the blood when circulating in the body; carries blood cells through the circulatory system. Composed of water, dissolved proteins, sugar, wastes, salts, hormones, etc.
  • Erythrocytes: red blood cells that contain hemoglobin (protein) that enable them to carry oxygen.
  • Leukocytes: white blood cells come in 5 differentiations (granulocytes, basophils, eosinophils, neutrophils and phagocytes) to help fight off infection through the body’s immune response and the creation of antibodies.
  • Thrombocytes: platelets; clotting cells that are formed in bone marrow from giant cells called megakaryocytes.
lymphatic system function
Lymphatic SystemFunction:
  • Acts as a drainage system to transport, via the bloodstream, proteins and fluid that have leaked into the interstitial fluid surrounding body cells.
  • Absorbs lipids from the small intestine.
  • Creates antibodies.
  • Lymph is clear watery fluid that surrounds cells.
structure of the lymphatic system
Structure of the Lymphatic System:
  • Lymph capillaries: tiny vessels that surround cells and carry lymph from tissues.
  • Lymph vessels: larger vessels that transport lymph to the thoracic cavity.
  • Lymph nodes: collections of stationary lymph tissue that produce lymphocytes and act as filters; contain macrophages, B cells and T cells that destroy foreign substances.
  • Right lymphatic duct: large duct in the upper chest that the lymph vessels empty into; drains the right side of the head and the chest.
  • Thoracic duct: large duct in the upper chest that the lymph vessels empty into; drains the lower body and the left side of the head.
  • Large veins in the neck: lymph is carried here from the ducts where it then enters the bloodstream.
  • Spleen: composed of lymph tissue; destroys old blood cells, filters foreign substances from the blood, activates lymphocytes that produce antibodies and stores blood.
  • Thymus gland: composed of lymph tissue; especially important during childhood and helps with the creation of antibodies and immune cells.
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