• 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...


´╗┐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.


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.


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)

    Progesterone decreases the contractility of the uterine smooth muscle and also inhibits lactation during pregnancy. In males the levels are similar to those of the females during the follicular phase. Oestrogen and testosterone is present in both males and females. In males, the oestrogen is produced by the adrenal cortex.

  2. Peer reviewed

    Effect of Caffeine on the Heart Rate of Daphnia

    3 star(s)

    Observation: The table below shows the different concentration of caffeine solutions (%) and the respective heart rate of Daphnia Concentration of caffeine solution (%) The Number of Heart Beats of Daphnia in 15 seconds Heart rate of Daphnia ( Beats/minute)

  1. Fundamental human anatomy and physiology.

    Reference: http://training.seer.cancer.gov/module_anatomy/unit9_4_resp_passages.html Class notes hand out 26 / 2/ 2008 Web sight viewed on 27 / 2 /2008 * The respiratory system consist of the nose, mouth, throat, larynx, trachea, bronchi and lungs, therefore the function of the respiratory system is to help gaseous exchange to take place in the lungs and tissue cells of the body.

  2. The Skeletal and Muscular System

    Describe the functions of the skeleton. The following are the six functions of the skeleton: 1. Protection. It protects important internal organs of the body such as heart, lungs, spinal cord and the brain. Examples are the skull which protects the brain, the vertebrae that protect the spinal cord and the ribcage which protects the heart and lungs.

  1. Blood System Assignemnt

    The first heart sound (lub) is caused by the acceleration and deceleration of blood and a vibration of the heart at the time of the closure of the tricuspid and mitral valves. The second heart sound (dub) is caused by the same acceleration and deceleration of blood and vibrations at the time of closure of the Pulmonic and aortic valves.

  2. The Endocrine System

    produce the characteristic appearance seen in those with the disease. Common causes include Graves' disease, in which antibodies are produced by the immune system which then bind to receptors on the thyroid and cause it to increase production, and solitary and multiple 'hot' nodules of thyroid tissue which overproduce T4 and T3.

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