CARDIOVASCULAR SYSTEM ::
The functioning of a city is possible through an intricate system of streets and roads which link houses offices stores factories hospitals and other key places various parts of the human body require continual supply of nutrient and oxygen and a continual removal of waste this is being done by the circulatory system it consists of the pumping station the heart and the intricate network of blood vessels the blood vessels which carry blood from the heart are the arteries they divide and redivide into arterioles finally ending into minute hair like capillaries the capillaries form venules and veins which bring the blood back from various parts of the body and pour it into the heart
BLOOD is the vital fluid of the body which is concerned with the transport of respiratory gases nutrition and excretory products besides it is also involved in the maintenance of water acid base balance (pH) Body temperature and hence homeostasis of the body leucocytes (WBC) present i the blood give protection to the body from bacteria toxins foreign material etc
LYMPHATIC SYSTEM connected to the circulatory system is the lymphatic system which consists of the closed lymphatic vessels containing a fluid called lymph the lymph flow in lymph sinuses capillaries and vessels ending in lymph nodes the lymph nodes are finally drained into the heart through lymphatic ducts which end in subclavian vein
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