explain about human heart and its structure...!!!
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Answer:
Chambers of the Heart
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:The right atrium receives blood from the veins and pumps it to the right ventricle.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:The right atrium receives blood from the veins and pumps it to the right ventricle.The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:The right atrium receives blood from the veins and pumps it to the right ventricle.The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:The right atrium receives blood from the veins and pumps it to the right ventricle.The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.The left ventricle (the strongest chamber) pumps oxygen-rich blood to the rest of the body. The left ventricle’s vigorous contractions create our blood pressure.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:The right atrium receives blood from the veins and pumps it to the right ventricle.The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.The left ventricle (the strongest chamber) pumps oxygen-rich blood to the rest of the body. The left ventricle’s vigorous contractions create our blood pressure.The coronary arteries run along the surface of the heart and provide oxygen-rich blood to the heart muscle. A web of nerve tissue also runs through the heart, conducting the complex signals that govern contraction and relaxation. Surrounding the heart is a sac called the pericardium.
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Explanation:
#Introduction to the Human Heart
The human heart is one of the most important organs responsible for sustaining life. It is essentially a muscle, about the size of a clenched fist.
The human heart functions throughout a person’s lifespan, pumping almost 200 million liters of blood. A human heart roughly beats 2.5 billion times during a human lifespan, making it one of the most robust and hardest working muscle in the human body.
Besides humans, most other animals also possess a heart that pumps blood throughout their body. Even invertebrates such as grasshoppers possess a “heart”, though they do not function the same way a human heart does.
#Position of Heart in Human Body
The human heart is located between the lungs, behind and slightly towards the left of the sternum (breastbone). Two-thirds of the heart is situated on the left side of the chest, and the remaining part is balanced on the right side of the chest.
#The Function of Heart
The function of the heart in any organism is to maintain a constant flow of blood throughout the body. This replenishes oxygen and circulates nutrients among the cells and tissues. Also, because the human heart is a homologous organ, it functions no differently from any other vertebrates that possess a heart. Following are the main functions of the heart:
One of the primary function of the human heart is to pump blood throughout the body.
Blood delivers oxygen, hormones, glucose and other components to various parts of the body, including the human heart.
The heart also ensures that adequate blood pressure is maintained in the body
#Structure of the Human Heart
The human heart is about the size of a human fist and is divided into four chambers, namely two ventricles and two atria. The ventricles are the chambers that pump blood and atrium are the chambers that receive blood. Among which both right atrium and ventricle make up the “right heart,” and the left atrium and ventricle make up the “left heart.” The structure of the heart also houses the biggest artery in the body – the aorta.
Human Heart
Human heart diagram highlighting the various anatomical structures.
The right and the left region of the heart are separated by a wall of muscle called the septum. The right ventricle pumps the blood to the lungs for re-oxygenation through the pulmonary arteries. The right semilunar valves close and prevent the blood from flowing back into the heart. Then, the oxygenated blood is received by the left atrium from the lungs via the pulmonary veins. Read on to explore more about the structure of heart.
#External Structure of Heart
One of the very first structures which can be observed when the external structure of the heart is viewed is the pericardium.
#Chambers of the Heart
Vertebrate hearts can be classified based on the number of chambers present. For instance, most fish have two chambers, reptiles and amphibians have three chambers. Avian and mammalian hearts consists of four chambers. Humans are mammals; hence, we have four chambers, namely:
Left atrium
Right atrium
Left ventricle
Right ventricle
Atria are thin, less muscular walls and smaller than ventricles. These are the blood-receiving chambers that are fed by the large veins.
Ventricles are larger and more muscular chambers responsible for pumping and pushing blood out to the circulation. These are connected to larger arteries that deliver blood for circulation.
The right ventricle and right atrium are comparatively smaller than the left chambers. The walls consist of fewer muscles compared to the left portion, and the size difference is based on their functions. The blood originating from the right side flows through the pulmonary circulation, while blood arising from the left chambers is pumped throughout the body.
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