Question

describe the structure and function of human heart for 3 marks​

Answer 1

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.

functions of human heart

• take the blood from vena-cava(both superior and inferior)
• pump it through the pulmonary artery to the lungs
• after the lungs oxygenate the received blood, blood is sent to the heart through the pulmonary vein
• the heart then pumps the oxygenated blood for the whole body through the aorta

Answer 2

Hope it's helpful...........