It consists of a network of organs and connecting channels (vessels) responsible for the flow of blood, nutrients, hormones, oxygen and other gases, with waste removal from cells. Also it helps to maintain constant body temperature in human and other constant body animals.

cardiovascular system

IMAGE Source:OpenStax College. Anatomy & Physiology, Connexions

Web site. http://cnx.org/content/col11496/1.6/, Jun 19, 2013.

- HEART: It is the most vital organ in the body. It is a hollow, pump like organ of blood circulation, composed mainly of rhythmically contractile smooth muscle, located in the chest between the lungs and slightly to the left and consisting of four chambers: a right atrium that receives blood returning from the body via the superior and inferior vena cavae, a right ventricle that pumps the blood through the pulmonary artery to the lungs for oxygenation, a left atrium that receives the oxygenated blood via the pulmonary veins and passes it through the mitral valve, and a left ventricle that pumps the oxygenated blood, via the aorta, throughout the body. It starts working even before birth inside the womb. Weighing less than 350 grams, it pumps about 4,300 gallons of blood per day through the body and supplies oxygen and nourishment to all the organs. Lungs add oxygen in blood and takes out carbon dioxide. Heart beats 1,00,000 times a day, continuously pumping the blood through more than 60,000 miles of tiny blood vessels.
- LUNGS: Lungs are two sac like respiratory organs in the thorax of humans which oxygenate the blood and remove its carbon dioxide.

- VALVES: To control the flow of blood, as one that permits blood to flow in one direction only
- FLOW CHANNELS: It include the network of arteries and veins to transmit blood from heart to other body parts and to bring it back to heart.
Circulatory system diseases represent the major lifestyle diseases of modern day due to rising pollution and obesity levels. Major ones are:



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