SKL UN SMP 2014 IPA PDF

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SKL UN SMP 2014 IPA PDF

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SKL UN SMP 2014 IPA PDF

Blood pressure is lowest in the veins.

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Note that blood flow in skl un smp 2014 ipa capillaries and veins is non-pulsatile Figure Blood pressure in the blood vessels. However, pressure should not be so high that it ruptures the small blood vessels or places undue strain on the heart.

Blood pressure is maintained in the short term by the complex interaction of systemic vascular resistance SVR and cardiac output CO. Longer-term regulation also calls for adjustment to blood volume.

SKL UN SMP 2014 IPA PDF

Cardiac output is the skl un smp 2014 ipa of blood pumped by the heart each minute. Systemic vascular resistance is the resistance to blood flow, determined by blood vessel diameter, blood viscosity and total length of blood vessels. The body has short-term control over blood vessel diameter via sympathetic nerves that cause the smooth muscle surrounding the arterioles to contract.

SKL UN SMP 2014 IPA PDF

The smaller the diameter of the lumen, the greater the resistance Figure Effect of sympathetic stimulation of arterioles on vascular resistance. If either cardiac output or systemic vascular resistance decrease then blood pressure decreases. If either heart rate or stroke skl un smp 2014 ipa decrease then cardiac output will decrease and so BP decreases.

Arterial blood pressure is monitored by pressure sensors in the circulatory system called baroreceptors, the most important of which are found on the aortic arch and the carotid sinus.

These stretch receptors monitor changes in blood pressure and send neural signals to the cardiovascular control centre in the medulla.

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The medulla, via the autonomic nervous system regulates the blood pressure by adjustments to the cardiac output of the heart and the peripheral resistance of the arterioles. This process is called the baroreceptor reflex. We will now examine the response of the baroreceptor reflex to decreases and increases in skl un smp 2014 ipa pressure: A decrease in blood pressure can be caused by haemorrhage, dehydration, heart attack and even just standing up too quickly.

The drop in BP is detected by the baroreceptors as a reduction in arterial stretch which reduces the rate of signals sent to the control centre in the medulla via the afferent neurons.

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The medulla then increases the sympathetic activity and decreases skl un smp 2014 ipa parasympathetic activity of the circulatory system. This has the effect of increasing both the stroke volume and heart rate which increases the cardiac output.

The arterioles are subject to sympathetic vasoconstriction which increases the systemic vascular resistance.

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All of these contribute to an increase in blood pressure Figure Control of short-term blood pressure fluctuations by the baroreceptor skl un smp 2014 ipa. Control of short-term blood pressure fluctuations by the baroreceptor reflex An increase in blood pressure is normally and indication of exercise.

Obviously, a response that reduced cardiac output would be undesirable, as it would limit our ability to exercise. Fortunately, complex mechanisms in the central nervous system suppress the baroreceptor response and skl un smp 2014 ipa vasodilation occurs that redistributes blood to the exercising muscles.

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Her name is Susan, and I got her last week. Let me know if Saturday will be OK for my coming.

SKL UN SMP 2014 IPA PDF

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Please check the opt-in box to acknowledge that you would like to subscribe. Thirty-four are below 3. Only 26 qualifying starters are at 4.



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