English - Biology (Transportation)
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EnglishVoice Age
Middle Aged (35-54)Accents
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class tent biology chapter one Part four Hello students Hope you all are doing well. Previously, we studied about respiration. Let's study about transportation, transportation in human beings for the transportation of various substances. In human body, the circulatory system is responsible. Blood place the major role of the carrier of the substances. Let's talk about heart. Heart is a muscular organ. It is composed of cardiac muscles. It is a pumping organ, which pumps the blood. It is composed of four chambers that is right atrium, right ventricle, left ventricle and left atrium. Contraction of cardiac muscle is stall, and their relaxation is dia stall. Let's talk about arteries. Arteries are thick walled blood vessels, which carry oxygenated blood from the heart to different organs. But the pulmonary arteries carries deoxygenated blood from heart. Two lungs. Let's talk about wanes. Veins are thin walled blood vessels that carry deoxygenated bled from different organs to the heart, But pulmonary veins carry oxygenated blood from lungs to heart. Valves are present so that backflow can be prevented