Blood vessels and blood circulation

by Joseph Alpert, MD

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    Welcome back to the second basic lecture in vascular medicine. During this lecture, we’re going to go into a little more detail concerning the blood vessels and how they function in the circulation. You’ll remember from the last lecture that we talked about the main classes of blood vessels. That’s what we’re going to talk about first: the artery system and the venous system and the capillaries. So here’s a little diagram that shows you. We’ve seen this one before actually. It shows you that the arteries start out large and progressively become smaller eventually ending in arterioles that are the major resistance factor in the circulation. Then we arrive at the capillaries where most of the nutrient and waste exchange goes on with the cells of the body. And then that blood collects in small venules, eventually large veins and returns to the heart. So let’s talk about the arteries. These are the vessels that convey oxygenated blood away from the heart – away from the left ventricle – eventually to the body tissues to the capillaries. They start out big and they keep bifurcating or dividing into smaller and smaller vessels, eventually the arterioles, as they get further away from the heart until eventually the arterioles connect to the capillaries where the blood gives off its oxygen and nutrients and collects waste products. The circulation usually is drawn and with the arterial system in red and the venous system in blue. The largest and most important blood vessel in the body is the aorta. This is the large blood vessel that leaves the heart just above the aortic valve and supplies blood to each of the branching arteries throughout the body. And we’re going to be looking at each of those branching arteries in a minute. The first...

    About the Lecture

    The lecture Blood vessels and blood circulation by Joseph Alpert, MD is from the course Vascular Medicine: Basics. It contains the following chapters:

    • Main classes of blood vessels
    • Artery
    • Capillaries
    • Veins
    • How are blood vessels structured?
    • Which physical principles influence blood circulation?
    • Blood vessels and circulation - Summary

    Quiz for lecture

    Test your knowledge with our quiz for lecture Blood vessels and blood circulation.

    1. Vena cava
    2. Subclavian
    3. Carotid
    4. Femoral
    5. Brachial
    1. The venous valves
    2. Increased levels of carbon dioxide
    3. Left ventricular ejection of blood into the aorta
    4. Lymphatic drainage of tissue fluid
    1. Pressure within the capillary
    2. Oncotic pressure
    3. Aortic pressure
    4. Tissue pressure

    Author of lecture Blood vessels and blood circulation

     Joseph Alpert, MD

    Joseph Alpert, MD

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