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TYPES OF RESPIRATION, , e External respiration, e Internal respiration, , MECHANISM OF RESPIRATION: It involves nose,, nostrils, lungs, blood and cell through which, oxygen and carbon dioxide are exchanged and, energy is produced in the body., , CIRCULATORY SYSTEM: The transport of material, between various parts of body is called circulatory, system. It consists of heart, blood vessels,, arteries, arterioles, capillaries, veins, venules and, fluid., , STRUCTURE OF HEART: Heart is fist shaped. It, consists of four chambers which collect, impure/deoxygenated blood from different parts, of body and after purification/oxygenation it supplies pure/oxygenated blood to different parts of, body through blood vessels., , BLOOD: Blood is a special kind of fluid which acts, as a medium of transporting nutrients and gases, from one part of body to another., , HEART RATE: It is the number of pumping of heart, in one minute., , STROKE VOLUME: It is the volume of blood