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In general Autonomic tone of peripheral blood vessels increase when?

sympathetic stimulation is increased.


Autonomic tone of peripheral blood vessels would be greatest when?

When sympathetic stimulation is increased.


Name two factors that increase peripheral resistance?

Peripheral resistance can be increased by an increase in blood volume and the constricting of blood vessels.


What does peripheral blood vessels mean?

Peripheral means "at the edge". The blood vessels further away from the heart.


How do peripheral vasodilators work?

Peripheral vasodilators work by relaxing the smooth muscle in the walls of blood vessels, which causes them to dilate and widen. This leads to a decrease in resistance to blood flow, resulting in increased blood flow to the peripheral tissues. This can help reduce high blood pressure and improve circulation.


Peripheral vascular diseases are disorders of the blood vessels that are located outside of the heart and brain?

Peripheral vascular disease is disease of the blood vessels of the peripheries i.e. the limbs. Atherosclerosis, how ever is a generalised disease and other vessels are also involved


What is the large peripheral blood vessels into which extra-embryonic blood vessels open?

vitilline vein


In the body what is the physiological cause of radii changes in blood vessels?

Vessel diameter can change quickly through casconconstruction or vasodilation. Most of the peripheral resistance occurs in arterioles (the small vessels of the arterial system). When these smooth muscles contract or relaz, peripheral resistance is either increased or decreased.Source: Modern Anatomy & Physiology by Ateegh Al-Arabi


How will blood peripheral resistance change as a result of increased hematocrit?

An increased hematocrit indicates a higher ratio of RBC's in the blood. Any increase in cellular elements, whether WBC's, RBC's or platelets, will act to essentially mechanically "thicken" the blood viscosity, sort of like using a heavier grade oil in your car. Increased blood viscosity will increase peripheral resistance, as it becomes harder for the heart to circulate the thicker blood, especially in the capillaries.


Why is there bounding peripheral pulse in patent ductus arteriosus?

The output runoff through the PDA from the left ventricle's output to the pulmonary circulation causes a lower diastolic pressure resulting in a lower than normal pressure in diastole. This gives the feeling of a bounding pulse when the heart beats due to the increased difference between the systolic and diastolic pressure and is interpreted as a bounding pulse in the peripheral vessels.


What in tobacco constricts blood vessels?

Nicotine is the blood vessels' constrictor. Not all blood vessels, of course, but mainly the peripheral blood vessels, including the brain capillary blood vessels.


What is main site of peripheral resistance?

arterioles offer maximum peripheral resistance .Skin and skeletal muscle blood vessels represent most imp. site of peripheral resistance.