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The arteries are the blood vessels which take oxygenated blood from the heart and to the rest of the body. The main artery is the aorta which then branches off into smaller arteries, then these eventually break off into even smaller vessels called arterioles which contol the amount of blood supplied to individual tissues. From arterioles branch capillaries which arethe site of exchange between the blood and the cells. Once the body tissues have used all the oxygen and nutrients in the blood, it is returned to the heart by the veins. The aorta aids in pumping because it is highly elasticated and so acts like a capacitor. It takes all the blood form the ventricle as a burst which stretched its walls out. The walls then squeeze back down pushing the blood along more continuously.
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Which vessel would have a larger lumen an artery or its corresponding vein?
Veins have a much larger lumen compared to arteries, this is for several reasons: Blood in the arteries has left the heart (with exception to the pulmonary artery) much sooner than the blood in veins, therefore it is under much more pressure, so needs more muscle tissue around its walls to a) cope with that pressure and b) to aid the heart in pumping blood. Blood in veins has much lower pressure, meaning it needs less muscle tissue around the walls, leaving much more room for a hollow lumen (which is lined with valves to prevent backflow of blood).
How blood propelled through the arteries as opposed to the veins?
The blood flows through arteries because of the pressure generated by the heart and maintained by the action of the arterial muscles. Conversely, while veins also have a muscle, called the Tunica Media (the inner middle layer of the vein), aiding in propulsion of the blood flow through the heart, they must rely on internal valves to aid in propelling blood through them. Veins are a closed system, so they do not have the benefit of the pressure of the heart in propelling blood through them. The valves in veins assist in propusion of the blood through them and prevention of blood clots.
Who discovered that venous valves help aid in the return of blood to the heart?
William Harvey
What happens during a heart attack?
In a heart attack (myocardial infarction) the heart is deprived of oxygen, and this eventually causes necrosis of the deprived cardiac tissues. This tissue death can result in heart failure and deadly arrhythmia.Basically plaque builds up in the coronary artery and when the plaque hardens it explodes and platelets (cells that help to clot arteries and veins when they are cut) come in and prevent further release of the plaque that has explodes. However, this clotting can block an artery completely and stop blood flow to a part of the heart. When the blood flow stops, so does the oxygen to that part of the heart. Because of the lack of oxygen to keep the muscle going, muscle cells die in the heart, that's what happens in the heart during a heart attack!When you have a heart attack the heart stops beating. It's because it clogs up the heart and you sometimes you will die or have brain damagewhen you have a heart attack some of your heart cells stay without oxygen (Hypoxia )which may hurt or kill them related to how fast you get a medical care .
The main job of the heart is to?
If you are thinking of the organ, the heart, its main function is to pump blood throughout the body. Blood circulation is vital because this is how most of the organs of your body are able to get nutrients and oxygen as well as get rid of waste products.If there was no heart, the blood in your body would settle down in the lower parts because there would be nothing to work against gravity.So the heart is the pump for the blood. It pushes the blood to, and through the lungs so that new oxygen can enter the bloodstream and carbon dioxide (and other gases) can leave the blood. The heart also pumps the blood through the various organs that perform specialized functions, such as the liver and kidneys, which work to remove waste products from the blood. The heart also pushes the blood around your whole body, even forcing the blood into the capillaries that surround most living tissue in your body.This is why people with heart problems often have swelling in their hands and especially their feet. It takes a lot of force to move the blood throughout the vessels in your toes. When you heart isn't working with enough force blood can pool, or gather in the tissues that are the farthest from the heart.People have four chambers in their heart, and each pumps blood at a different stage. This is why it is so dangerous when the heart's rhythm is interrupted. It's as if there were four pumps working together when one starts pumping at a different rate or at a different force than the other pumps.Your heart doesn't have its own "brain" to decide when to pump, that information comes from your head. The human brain sends special electrical signals to your heart. These small electrical pulses cause the various muscles that make up your heart beat at the right times.Many dangerous problems with your heart happen when the muscles or something in the links between the brain and your heart get confused. The special first aid treatment with the big paddles and the electrical shock is designed to get the heart muscles back into sync with one another. In one sense it is like hitting a reset button. This special electric shock is designed to reset the timing of your heart's beats, which often fixes at least some of the problems that cause a heart to stop working correctly.If you are asking about the "spiritual heart" (hence the posting in this section), the role of the "heart" changes from society to society. Some ancient cultures believed that the head was where your "soul" lived. Others believed it was the liver, or other organs. The view that "won the contest" throughout most of the world was that the human heart was the place where human life centered.
Why is venous pressure lower than arterial pressure?
The arteries have the pumping action of the heart to aid them. By the time the blood gets to the veins the pressure the heart exerted on the blood is significantly less
How does blood circulates in a human body?
Via the circulatory system which consist of veins, arteries and capillaries which aid in the transportation of all blood to and from the heart muscle.
Which vessel would have a larger lumen an artery or its corresponding vein?
Veins have a much larger lumen compared to arteries, this is for several reasons: Blood in the arteries has left the heart (with exception to the pulmonary artery) much sooner than the blood in veins, therefore it is under much more pressure, so needs more muscle tissue around its walls to a) cope with that pressure and b) to aid the heart in pumping blood. Blood in veins has much lower pressure, meaning it needs less muscle tissue around the walls, leaving much more room for a hollow lumen (which is lined with valves to prevent backflow of blood).
How blood propelled through the arteries as opposed to the veins?
The blood flows through arteries because of the pressure generated by the heart and maintained by the action of the arterial muscles. Conversely, while veins also have a muscle, called the Tunica Media (the inner middle layer of the vein), aiding in propulsion of the blood flow through the heart, they must rely on internal valves to aid in propelling blood through them. Veins are a closed system, so they do not have the benefit of the pressure of the heart in propelling blood through them. The valves in veins assist in propusion of the blood through them and prevention of blood clots.
What problems can be detected through a cardiac catheterization?
A technique of injecting a dye into the vascular system to outline the heart and blood vessels, a catheterization can aid in the visualization of any blockages, narrowing, or abnormalities in the coronary arteries.
What vessels require the movement of skeletal muscles to aid blood flow?
The vessels that pump blood round your body are called: veins, arteries and capilaries.
How do you diffrentiate between a vein and an artery?
Arteries are buried much deeper than veins. Near the heart you can see them throb with the pulse. If you pierce one, the blood spurts out, sometimes in rhythym with the heartbeat. The blood is bright red. Veins are darker in color, don't show a pulse, and don't spurt, but rather drain more slowly. The blood is a darker color from dark red to purple or maroon. In a first aid context, look for the bright red color and stop the arterial bleeding first, best with direct pressure.
Who discovered that venous valves help aid in the return of blood to the heart?
William Harvey
Where else in the circulatory system are valves found?
Valves can be found in the heart. They sit between the Atria and the Ventricles and help aid cardiovascular activity.
What does the heart muscle need in order to function?
Your heart needs blood, oxygen, and energy to function!!!!!!!!
What two events aid in venous return?
Venous blood does not have the relative advantage of high pressure that arteries have. Therefore, veins utilize two mechanisms to return the blood to the heart. First, veins have valves in them to keep the flow in one direction. This important especially when blood in the lower body must move upwards against gravity. Second, veins bone muscle contractions assist in pressuring the veins to move the blood along.
What is the structure of the wall in the arteries?
arteries have thick walls that are both strong and flexible. when your ventricles contract,blood surges through your arteries,causing their elastic walls to expand and then relax!!! :)
