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

Histology of Blood vessels

Extracts from this document...

Introduction

´╗┐Histology of Blood Vessels Arteries Arteries are blood vessels that carry blood away from the heart and this blood is normally oxygenated. Pulmonary arteries are the arteries of the pulmonary circulation, which is the portion of the cardiovascular system which carries deoxygenated blood away from the heart to the lungs and returns oxygenated blood back to the heart. The aorta is a main artery as it receives blood of the left ventricle of the heart through the aortic valve. The arterioles are the smallest of the arteries and they help regulate blood pressure by the contraction of the smooth muscle of their walls and their supply to the capillaries. The structure of the aorta and large arteries corresponds well to their function which serves as a blood reservoir and to stretch or recoil with the pumping action of the heart. ...read more.

Middle

The arteries have three layers and the smoothness of the inner layer enables blood to flow easily with no obstacles. Capillaries The capillaries are where all of the important exchanges happen in the circulatory system. Capillaries are very thin, fragile blood vessels that receive oxygen-rich blood from arteries, exchange oxygen and carbon dioxide and then deliver the waste-rich blood to the veins. Capillaries are only one epithelial cell thick and blood can only flow through them in a single file. The red blood cells inside the capillary release their oxygen, which passes through the wall and into the surrounding tissue. The tissue releases its waste products, e.g. carbon dioxide, which pass through the wall and into the red blood cells. The exchange occurs and the waste blood is carried back to the heart and lungs through the veins. ...read more.

Conclusion

It is a large blood vessel that carries blood from the lungs to the left atrium of the heart. There are four pulmonary veins which extend from the left atrium to the lungs. They are the right superior, right inferior, left superior and left inferior pulmonary veins. Pulmonary Veins are the large blood vessels that bring blood to the left side of the heart from the lungs. The pulmonary veins are the only veins in the body that transport oxygenated blood. Veins carry waste-rich blood back to the lungs and heart and they carry blood at a lower pressure than the arteries, so they are not as tough as the arteries. They have three layers, which are thinner and contain less tissue than those in the arteries. The veins have valves inside them, which help ensure the blood flows in one direction through the veins and that the blood flows against the force of gravity. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction 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 AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Human Reproductive System

    4 star(s)

    uterus for implantation and at the same time it affects the vaginal epithelium and cervical mucus, making the mucus thick and impermeable to sperm cells. Levels of progesterone decrease if pregnancy does not occur, which results in menstruation. The fertility varies over the 28 day period during the menstrual cycle and the most fertile day is between day 11-14.

  2. Peer reviewed

    Effect of Caffeine on the Heart Rate of Daphnia

    3 star(s)

    Due to the fact that caffeine is primarily an antagonist of the central nervous system's receptors for the neurotransmitter adenosine, the bodies of individuals who regularly consume caffeine adapt to the continual presence of the drug by substantially increasing the number of adenosine receptors in the central nervous system.

  1. The Endocrine System

    Diabetes Mellitus is a disorder of the islets of Langerhans in the pancreas; this prevents the body producing the hormone insulin, which therefore means the sugars of the body cannot be used properly. There are two types of Diabetes Mellitus, Type 1 occurs when the pancreas can't produce enough insulin.

  2. The Skeletal and Muscular System

    Movement. Movement, of either the whole body or a single limb, is possible due to the contraction and relaxation of skeletal muscles that are attached to the bones of the skeleton. When these muscles contract, they pull the bones to produce movement.

  1. Fundamental human anatomy and physiology.

    The atrium then contrasts and pushes the blood into the right ventricle. The tricuspid valve is there to make sure that the blood flows the correct way therefore when the right ventricle contracts, it forces the blood through the semi - lunar valve along the pulmonary arteries towards the lungs.

  2. Urinary system

    et al. 1998). The obstruction can lead to hydronephrosis (Figure 3 arrows), which is a dilation of renal pelvis and calyces caused by accumulation of urine. Figure 3 Bilateral renal hydronephrosis (arrows) It is important to identify stones, because renal failure can occur from an obstruction of the ureter.

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