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  • The Blood: The blood is a living, fluid, connective tissue. It circulates in the blood vessels constantly because of the pumping action of the heart. The blood consists of a fluid matrix called plasma and three types of living cells.
    1. Red blood corpuscles or erythrocytes.
    2. White blood corpuscles or leucocytes, and
    3. Blood platelets.
  • Blood Groups: the different types of blood groups are A, B, AB and O.
  • Functions of Blood
    Blood has many functions. The most important of these are
    1. Transport of food
    2. Transport of oxygen and carbon dioxide
    3. Transport of waste products
    4. Maintenance of water balance
    5. Transport of hormones
    6. Protection from invading organisms and foreign substances
    7. Temperature regulation
    8. Tissue support
    9. Blood coagulation
  • The Heart: is made of the auricles and ventricles.
  • Arteries and Veins: arteries carry oxygenated blood and veins carry deoxygenated blood, exceptions are the pulmonary artery carrying deoxygenated blood and pulmonary veins carrying oxygenated blood.
  • Lymphatic System: The lymphatic system consists of a network of vessels and lymph organs, like lymph nodes, bone marrow, spleen and thymus. The fluid present in the lymphatic system is called lymph.
  • Diseases Related to Circulatory System: hypertension, atherosclerosis, arteriosclerosis.

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