The three main parts of the circulatory system are the heart, the blood and the blood vessels. The purpose of the circulatory system is to transport oxygen throughout the body.Continue Reading
In humans, the heart is a fist-sized muscle located slightly to the left of center in the chest. It acts as an engine for the circulatory system, pumping blood through the blood vessels. It will beat approximately three billion times in an average human lifespan.
The blood vessels are hollow tubes that conduct blood from the heart to the body’s tissues and back again. There are three types: arteries, veins and capillaries. Arteries carry oxygenated blood away from the heart and to the tissues. The one exception to this is the pulmonary artery, which carries deoxygenated blood from the heart to the lungs. They are thick-walled, elastic vessels that contain no valves. Veins carry blood back to the heart after the body tissues have used the blood’s oxygen. They have thinner walls than arteries and contain valves to keep the blood from flowing backward. Capillaries are tiny vessels that connect arteries to veins. Because their walls are so thin, they allow oxygen and other nutrients to pass from the vessels to the surrounding tissue.
Blood is made of two parts: plasma and blood corpuscles (or cells). Plasma is the liquid portion of blood and is made mostly of water. There are three types of corpuscles: red blood cells, white blood cells and platelets. The red blood cells carry oxygen and carbon dioxide, white blood cells attack germs and foreign bodies and platelets help to clot the flow of blood in cuts or injuries.Learn more about Blood
All of the blue-colored blood vessels on a blood flow diagram show passages carrying deoxygenated blood from the heart to the lungs, while all of the red-colored passages show oxygenated blood being circulated throughout the body. The heart's right chambers pump deoxygenated blood, while the left chambers pump oxygenated blood.Full Answer >
The human circulatory system, also known as the cardiovascular system, includes the heart, blood vessels and the lungs, according to LiveScience. The circulatory system transports nutrients, oxygen, hormones and other substances to cells throughout the human body.Full Answer >
The basic circulatory system of vertebrate animals, which are those with a backbone, consists of a heart, the blood and the arteries and system of blood vessels. The heart pumps the blood first to the arteries and then throughout the body via the system of blood vessels.Full Answer >
A person who loses approximately 40 percent or more of his blood volume needs immediate emergency care; otherwise, the strain on the circulatory system becomes fatal, explains Medical Daily. Known as class 4 hemorrhaging, this condition prevents the heart from maintaining pressure for circulation, and the vital organs soon begin to fail. A person with this much blood loss goes into hypovolemic shock, and even if under care, the prognosis depends on various underlying factors.Full Answer >