Main body system
The cardiovascular system has three main functions:
Transport- Transportation of oxygen, nutrients and hormones to cells and removal of metabolic wastes such as carbon dioxide, heat and nitrogenous wastes.
Regulation- Of body temperature, fluid pH and water content of cells
Protection- By white blood cells, antibodies and complement proteins that circulate in blood and defend again foreign microbes and toxins. Also white blood cells clot when body is injured. Heart is associated to cardiovascular system, heart is also known as the blood-pump of the body. It pumps blood through the circulatory system to all parts of the body. The blood carries food and oxygen to the cells and carries away carbon dioxide and waste materials. The right hand side of the heart receives de-oxygenated blood from the body tissues, and pumps it to the lungs. The left-hand side of the heart receives oxygenated blood from the lungs and pumps it into the body, so that the oxygen can be delivered to cells.
One of the most important functions of the respiratory system is to supply oxygen to all the cells in the body. Every cell in the body requires a constant supply of oxygen to stay alive. Because most of the cells are not in contact with air, the respiratory system must supply them with oxygen. Another function is to remove carbon dioxide and water from the body. A lung is associated with respiratory system, the function of the lungs is to let out carbon dioxide and bring in oxygen. Digestive system
The primary function of the digestive system is to break down the food we eat into smaller parts so the body can use them to build and nourish cells and provide energy. It also removes undigested waste at intervals. The liver is the main producer of important chemicals. Stomach is associated with digestive system; the stomach's main function is digestion. It does this by:
Storing the food we...
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