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Arteries and blood vessels.
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∙ 12y ago
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Why is blood pressure higher lying down than sitting or standing?
In most cases, body position has very little effect on blood pressure. In many cases, the blood pressure will rise a little as a result of the heart rate going up when sitting or standing compared to lying down. Some people have an imbalance in their Autonomic Nervous System, which controls constriction and dilation of blood vessels and may find that their blood pressure is lower when standing as opposed to when lying down or sitting.
The circulation of blood through the vascular system is influenced by?
Blood flow can be affected by such factors as clots and blood pressure which are in turn affected by obesity and genetics.
What is vasopressor therapy?
Vasopressor therapy is a medical strategy that aims to improve blood pressure and other hemodynamic parameters by utilising various drugs that act to promote the constriction of various vascular pathways.
How high blood pressure built up in the glomerulus?
It builds up because the calibre of the efferent arteriole is less than that of the afferent arteriole. The cappilary pressure is opposed by the lower osmotic pressure or the blood and the lower filtrate hydrostatic pressure in the glomerular capsule.
Is the glomerular filtration rate the same when the efferent arteriole is constricted and dilated?
OLD, INCORRECT ANSWER: Changes in the diameter of the efferent arteriole will either increase (dilation) or decrease (constriction) the blood flow to the glomeruli. An increased flow means a more blood getting filtered over time. NEW, CORRECT ANSWER The 'efferent' arteriole leaves the renal corpuscle. It is easy to remember which direction efferent and afferent things are going by thinking e=exit and a=arrive. If you constrict the efferent arteriole, you actually inhibit blood from leaving the glomerulus, thus increasing the outward hydrostatic pressure pushing fluid into Bowman's capsule and increasing filtration. If you dilate the efferent arteriole, then you reduce pressure in the glomerular capillaries and reduce filtration.
How is blood pressure affected when you increase dilation?
Blood pressure drops as dilation increases. This occurs because of decrease resistance.
Sympathetic nervous system stimulation causes what?
with stimulation of the sympathetic nervous system there will be a. constriction of the pupils b. dilation of the coronary arteries c. constriction of selected blood vessels d. profuse sweating
What is vasomotor instability?
Relating to, causing, or regulating constriction or dilation of blood vessels. Source: Answers.com
What promotes constriction of blood vessels resulting in elevation of blood pressure?
Angiostensin
What effect does serotonin have on blood vessels?
Serotonin has an constrictive effect on the blood vessels in the brain. It's role in the rest of the body can cause both dilation or constriction.
What causes sympathetic division stimulation?
with stimulation of the sympathetic nervous system there will be a. constriction of the pupils b. dilation of the coronary arteries c. constriction of selected blood vessels d. profuse sweating
What is vasoconstriction?
Vasoconstriction is the constriction or narrowing of blood vessels by small muscles in their walls, slowing or blocking blood flow. Vasoconstriction is the constriction of blood vessels that increases blood pressure.
Why is blood pressure higher lying down than sitting or standing?
In most cases, body position has very little effect on blood pressure. In many cases, the blood pressure will rise a little as a result of the heart rate going up when sitting or standing compared to lying down. Some people have an imbalance in their Autonomic Nervous System, which controls constriction and dilation of blood vessels and may find that their blood pressure is lower when standing as opposed to when lying down or sitting.
Is smoking bad for high blood?
Smoking can cause hardening and constriction of the arteries so it is bad if you have high blood pressure.
Which action below is affected by an antihistamine a. blood vessel dilation b. phatocytosis of antigens c. MHC presentation by macrophages d. the secondary immune response e. colonal selection of ant?
A. Blood Vessel Dilation
What does arterial pressure reflect?
An individual's blood pressure is dependent on several factors including genetics, weight and stress levels. While there is nothing we can do to change our genetics one can eat a healthy diet and manage stress in an attempt to control blood pressure.
Is blood pressure affected by Vegemite?
yes
