Describe the functioning of heart
Answers
Hey mate!!!
The main function of the human heart is to pump blood through the body, setting in place a system for the distribution of different substances, mainly oxygen (O2), carbon dioxide (CO2) and hormones. The heart sends deoxygenated blood to the lungs which it then receives after the oxygenation process and sends to the rest of the body. When it receives it again without oxygen the whole cycle starts over. This is a key physiological activity because all of our cells need oxygen to function properly and lack of it causes severe trauma to the tissue/organ affected.
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Answer:
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.
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