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Neurohumoral Factors of Arterial Pressure– Blood Vessels and Pressure

by Thad Wilson, PhD
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    So now we have talked through a lot of factors, we went through a lot of anatomical things, we went through local factors. Let's end by talking about a few neurohumoral factors. Some of these are going to be spread across the couple of different organ systems that we'll discuss and so you might see some of these mechanisms come up in some future topics but I think it's important to talk about them now as well because you'll get a good feel for how these systems are interrelated. So let's go through them. The autonomic nervous system is probably the most important second by second changer of systemic vascular resistance as well as a number of the other parameters we have discussed such as heart rate and inotropy. The sympathetic nervous system is your fight or flight response or I like to refer to it as the flight or aggressive conflict mediation or the parasympathetic nervous system which is more that relax and digest. In the cardiovascular component, we always need to keep in mind that there the baroreflex might be involved. The baroreflex is going to govern arterial pressure and it does that by sensing blood pressure and sending important signals to cause there to either be a change in heart rate or vascular resistance. Hormonal factors such as circulating catecholamines can become very important and the main ones here are things like epinephrine released from the adrenal medulla, the renin-angiotensin-aldosterone system or RAAS system, anti-diuretic hormone or arginine vasopressin as well as our natriuretic peptides, ANP which is atrial natriuretic peptide and BNP which is brain natriuretic peptide. I know it says brain but it really is released by the ventricles. So let's go through this sympathetic activation. If you cause there to be an increase in...

    About the Lecture

    The lecture Neurohumoral Factors of Arterial Pressure– Blood Vessels and Pressure by Thad Wilson, PhD is from the course Vascular Physiology.


    Included Quiz Questions

    1. Ventricles
    2. Right atrium
    3. Brain
    4. Left atrium
    5. Lungs
    1. Increasing heart rate
    2. Decreasing heart rate
    3. Decreasing total peripheral resistance
    4. Decreasing stroke volume
    5. Vasodilatation

    Author of lecture Neurohumoral Factors of Arterial Pressure– Blood Vessels and Pressure

     Thad Wilson, PhD

    Thad Wilson, PhD


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