Question

What are the functions of
a)Pulmonary veins
b)Pulmonary arteries
c)Aorta
d)Septum

Answer 1

Hint: The human circulatory system is a double system, which means that there are two separate systems of blood flow: pulmonary circulation and systemic circulation. The adult human heart consists of two separate pumps, the right atrium and ventricle pumping deoxygenated blood into the pulmonary circulation, and the left atrium and ventricle pumping oxygenated blood into the systemic circulation.

Complete answer:
Five large vessels enter and leave the heart: the upper and lower vena cava, the pulmonary artery, the pulmonary vein, and the aorta.
Superior vena cava and inferior vena cava are veins that release deoxygenated blood from circulation in the body and empty it into the right atrium.

Pulmonary Arteries:	Pulmonary arteries carry deoxygenated blood from the right ventricle to the alveolar capillaries of the lungs to discharge carbon dioxide and to take up oxygen. These are the only arteries that carry deoxygenated blood and are considered to be arteries because they carry blood away from the heart.The short, wide vessel branches to the left and right pulmonary arteries that deliver deoxygenated blood to the respective lungs. Blood passes through the pulmonary valve as it is ejected into the pulmonary arteries.
Pulmonary Veins:	Pulmonary veins transport oxygenated blood from the lungs to the left atrium of the heart. Despite carrying oxygenated blood, this large vessel is still considered a vein because it carries blood to the heart. Four pulmonary veins are entering the left atrium. The right pulmonary veins pass behind the right atrium and the upper vena cava, while the left vein passes in front of the descending thoracic aorta.Both pulmonary arteries and veins are considered part of the circulation of the lungs.
Aorta:	The aorta is the largest artery in systemic circulation. Blood is pumped through the aortic valve from the left ventricle to the aorta. Aorta is a highly elastic artery capable of dilating and constricting the response to blood pressure and volume. When the left ventricle contracts to force blood into the aorta through the aortic valve, the aorta expands.This expansion provides potential energy to help maintain blood pressure during diastole, when the aorta is passively contracted. Blood pressure is highest in the aorta and decreases through circulation, reaching its lowest point at the end of venous circulation.The difference in pressure between the aorta and the right atrium is due to the flow of blood in the circulation, as blood flows from areas of high pressure to areas of low pressure.
Septum:	Septum is present in the heart between the right atrium and the left atrium (known as the atrial septum) as well as the atrial septum (known as ventricular septum). The septum separates the atria and the ventricles in such a way that it forms a barrier between the chambers of the heart and prevents the mixture of oxygenated and deoxygenated blood.

Note: Great vessels are the major vessels that carry blood to the heart and away from the heart to and from the pulmonary or systemic circuit. Big vessels are collecting and distributing blood across the body from numerous smaller vessels.