p between structure, function, and blood velocity that make capillaries ideal fo
ID: 3480396 • Letter: P
Question
p between structure, function, and blood velocity that make capillaries ideal for exchange with the interstitial fluid STARLING the arterial side and bulk movement in on t FORCES-direction, names, relative size; what causes bulk movement out on the venous side Blood Pressure Where is it sensed? What changes occur when it is too high? Think arterioles What about too low? Long term changes, where can they happen? Think too much plasma that can't be controlled by changes in total peripheral resistance What causes heart sounds? When do they happen in the cardiac cycle? Blood flow through the heart, where is oxygenated or deoxygenated blood found, what parts of the heart feed into the lungs vs. the rest of the bodyExplanation / Answer
Blood pressure is defined as the pressure exerted by the flow of blood on the lateral vessel wall. Blood pressure is sensed by the baroreceptors located in the aortic and carotid bodies. If the blood pressure is increased, it will stretch the arteries and stimulate increased activity within the baroreceptors. Baroreceptor stimulation decreases the sympathetic input to blood vessels and increases the parasympathetic activity. In case of low blood pressure, the sympathetic nervous system is activated resulting in vasoconstriction.
The first heart sound is caused by the closure of mitral and tricuspid valves. The second heart sound is caused by the closure of aortic and semilunar valves. First heart sound occurs at the end of atrial systole and the second heart sound occurs at the end of ventricular systole.
Deoxygenated blood is found in the right atrium, right ventricle and is carried by the pulmonary artery to the lungs. The oxygenated blood is carried from the lungs by pulmonary veins to left atrium which in turn drains into left ventricle. The left ventricle pumps oxygenated blood into aorta to be supplied to rest of the body.
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