• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Arteries are adapted to their function in blood transport from the heart.

Extracts from this document...

Introduction

Arteries are adapted to their function in blood transport from the heart Arteries are tubular vessels that carry blood from the heart to the rest of the body. Arteries have a very thick lining; the outer lining is made from collagen fibres and elastic tissue. This is there because it helps the arteries expand under the high pressure that the blood is forced out from the heart. The second layer is made from thick smooth muscle. This is there so when the arteries expand the muscle can contract when this happens it pushes the blood along the vessel in a smooth regular fashion. This is called a pulse. The arteries do not need valves; this is because the blood is being pumped at such a high pressure and the fact that the muscle contracts to stop the blood going back along the artery. The inner lining is made from epithelium cells. These are there to ensure that the blood can run smoothly along the vessel without resistance. The blood travels through many arteries. ...read more.

Middle

The veins are made from the same materials as the arteries but are different in terms of thickness. The muscle around the veins is very thin this is because the blood is not at a high pressure. Because of the low pressure the blood has not got a pulse unlike the arteries, which do. They also have a larger lumen then the arteries to let more blood through. When the blood flows through the arteries the arteries split up into arterioles these then divide again into capillaries. They take blood to all of the tissues in the body. The capillaries are very small. They are also very thin vessels. They are made of one cell thick endothelium. These vessels link up the arteries with the veins. When the blood enters the capillaries it slows down, this takes away most of the pressure and allows for exchange of chemicals to take place more efficiently. The slowing down of the blood also results in the capillaries having no pulse or valves. The capillaries are so small that the lumen is only big enough for one red blood cell to squeeze through. ...read more.

Conclusion

Arteries have to undertake the pressures of the blood being pumped from the heart at 93mmHg. They are special in the way that they have thick muscle walls and are very elastic. If they were not elastic then the blood cannot be pushed though them at high pressures and the pulse would not happen. They are different from the veins in many ways; they do not have valves, they do not have thin muscular walls, blood is passed through the veins at low pressure this does not happen in the arteries, also veins have a large lumen whereas the arteries do not. They differ a lot from the capillaries too; capillaries are one cell thick obviously the arteries are not, the capillaries have no pulse, and a very small lumen a lot smaller than the arteries. The arteries, the veins and the capillaries all have different roles to play in the transport of blood around our bodies. They have been designed for these different roles, the arteries take blood away from the heart, the capillaries ensure that chemicals can be exchanged and the veins take the blood back to heart. This is all done in balance and is regulated by the heart and brain. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Explain how arteries, veins, and capillaries are adapted for their functions. Describe what happens ...

    4 star(s)

    If the plaque bursts into a vessel it damages the endothelium and the cells underneath are exposed to the blood, triggering the blood clotting mechanism. A resulting blood clot or thrombus that completely blocks any artery is called thrombosis. When this occurs in a coronary artery it causes a heart attack and in the carotid artery, a stroke.

  2. The Structure and Function Of Arteries, Veins and Capillaries.

    Skeletal muscles surround the veins; and contract to squeeze blood along the veins. Venous valves keep blood moving in only one direction. Venous valves are formed from the endothelium (vein lining), in places where the endothelial cells bend into the lumen of the vein.

  1. Stem Cell Research

    Therefore, stem cell research has the potential to answer incredibly important questions regarding serious diseases such as cancer and birth defects. Once more information is gained about these diseases; our treatments towards them will change, and in the future, will hopefully be much more effective than they are in our present society.

  2. The cardiovascular system is made up of the heart and the blood vessels, such ...

    about 95% of it is made of water Stroke volume is the volume of blood that is pumped out of the heart by each ventricle during one contraction Cardiac output is the amount of blood ejected from the left ventricle in one minute

  1. Factors Affecting the Development of Coronary Heart Disease.

    Activity helps to control appetite, which reduces the habit of unhealthy snacking. It also can help ease depression; during exercise the body releases chemicals called endorphins, which enhances feelings of good health and may ease stress. . Alcohol has been assumed for a long time to be bad for your health, so it was thought to be a risk factor.

  2. Blood - moving around our bodies via the circulatory system, consisting of the arteries, ...

    Although all red blood cells are fundamentally similar, the structures on their surfaces, often referred to as markers, do vary from one person to another. These differences serve as the basis for blood classification. Leukocytes, or white blood cells, are the larger than both red blood cells and platelets.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work