Human Blood Circulatory System-Arterial &Venous System

Human Blood Circulatory System

Many scientist and biologists worked for discovering the facts about the circulation of blood in the human body. Ibn-e-Nafees is honored as the first scientist who described the pathway of blood in human body first time ever in the history and William Harvey discovered the pumping action of heart and the pathway of blood in major arteries and veins. They are two scientists who work hard on the blood circulation of human body.

Arterial System

Large pulmonary trunk emerges from right ventricles and divides into right and left pulmonary arteries. These arteries carry the deoxygenated blood to right and left lungs. Through the heart chambers are continually bathed with blood, this does not nourish heart muscles. The oxygenated blood leaving the left ventricle of heart is carried in a large artery i.e. aorta. It ascends and forms an aortic arch. The arch cures left and descends inferiorly into body. The blood supply to heart muscles is provided by coronary arteries, which emerge from the base of aorta. Heart muscles are drained by coronary veins, which empty into right atrium. Coronary arteries and veins are collectively called coronary circulation and it is a part of systemic circulation.

Types of artery

• Artery to head region
• Aortic arch pulmonary artery
• Dorsal aorta
• Artery to arm
• Hepatic artery
• Renal artery
• Mesenteric arteries
• Lilac artery
• Femoral artery

Venous System

Veins from lungs called pulmonary veins.it return the oxygenated blood to the left atrium of heart. Two major veins are in the human body i.e. superior vena cava and inferior vena cava. Which carry deoxygenated blood from rest of the body and empty into right atrium. Veins carrying blood from calf, foot and knee join together to form femoral vein.Superior vena cava form when different veins from head, shoulders and arms join together. From legs, the deoxygenated blood is returned to heart by many veins which empty into Inferior vena cava

 Types of veins

• Vein from head region
• Superior vena cava
• Vein from arm
• Pulmonary vein
• Inferior vena cava
• Hepatic portal vein
• Celiac vein
• Renal vein
• Lilac vein
• Femoral vein