explain the working of heart?
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Answers
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answer according to calss 10
Structure of Human Heart
The heart is a muscular organ covered by a double membrane called pericardium.
The pericardial fluid of the pericardium lubricates the heart.
The heart is divided into four chambers — two upper atria and two lower ventricles.
The inter-atrial septum separates the two atria and the inter-ventricular septum separates the two ventricles.
The atrium and the ventricle of each side are separated by the atrioventricular septum.
Superior and inferior vena cavae open into the right atrium.
The right ventricle opens into the pulmonary artery.
Four pulmonary veins open into the left atrium.
The left ventricle opens into the aorta.
The opening between the right atrium and right ventricle is guarded by the tricuspid valve.
The opening between the left atrium and left ventricle is guarded by the bicuspid (mitral) valve.
The opening of the right ventricle into the pulmonary artery and the opening of the left ventricle into the aorta is guarded by the semilunar valves.
Working of Heart
The right atrium receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventricular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction.
The right ventricle pumps the blood to the lungs to be reoxygenated.
The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventricular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one-way valve.
The left ventricle pumps the blood throughout the body through the aorta, which is the largest artery in the body. The walls of the left ventricle are the thickest among all the chambers.
acc to class 11
Working of Human blood circulatory system takes place in the steps below:
i. When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.
ii. When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1.
iii. When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries.
iv. The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart.
v. When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2.
vi. When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.
Structure of Human Heart
The heart is a muscular organ covered by a double membrane called pericardium.
The pericardial fluid of the pericardium lubricates the heart.
The heart is divided into four chambers — two upper atria and two lower ventricles.
The inter-atrial septum separates the two atria and the inter-ventricular septum separates the two ventricles.
The atrium and the ventricle of each side are separated by the atrioventricular septum.
Superior and inferior vena cavae open into the right atrium.
The right ventricle opens into the pulmonary artery.
Four pulmonary veins open into the left atrium.
The left ventricle opens into the aorta.
The opening between the right atrium and right ventricle is guarded by the tricuspid valve.
The opening between the left atrium and left ventricle is guarded by the bicuspid (mitral) valve.
The opening of the right ventricle into the pulmonary artery and the opening of the left ventricle into the aorta is guarded by the semilunar valves.
Working of Heart
The right atrium receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventricular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction.
The right ventricle pumps the blood to the lungs to be reoxygenated.
The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventricular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one-way valve.
The left ventricle pumps the blood throughout the body through the aorta, which is the largest artery in the body. The walls of the left ventricle are the thickest among all the chambers.
acc to class 11
Working of Human blood circulatory system takes place in the steps below:
i. When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.
ii. When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1.
iii. When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries.
iv. The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart.
v. When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2.
vi. When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.
Answered by
6
dear friend
the muscular strong walls contract ( squeeze ) , pumping blood to the rest of the body . on the surface of the heart , there are coronary arteries , which supply oxygen rich blood to the heart muscle itself.........the atria and ventricle work together , contracting and relaxing to the pump blood out to the heart .
HOPE IT WILL HELP YOU
plzz mark me as brain list
THANKS
the muscular strong walls contract ( squeeze ) , pumping blood to the rest of the body . on the surface of the heart , there are coronary arteries , which supply oxygen rich blood to the heart muscle itself.........the atria and ventricle work together , contracting and relaxing to the pump blood out to the heart .
HOPE IT WILL HELP YOU
plzz mark me as brain list
THANKS
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