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Hydrostatic pressure pushes fluid into / out of capillaries. Osmotic pressure drives fluid into / out of capillaries
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- Hydrostatic pressure forces plasma across capillary walls at venous end of capillary, and interstitial fluid enters arterial end of capillary by osmotic pressure. True or FalseCapillary ExchangeBlood flowing through a capillary bed experiences the following pressures:- Blood pressure in the capillary is 45 at the arterial end of the capillary- Blood pressure in the capillary is 15 at the venous end of the capillary- Blood osmotic pressure is 27mm at both the arterial and venous ends of the capillaryDoes water leave the capillary or enter the capillary at the arteriole end? Explain why in terms of blood pressure and osmotic pressure.Does water leave the capillary or enter the capillary at the venous end? Explain why in terms of blood pressure and osmotic pressure.Precapillary sphincters are found in metarterioles and serve to: OPrevent blood from flowing backwards Provide a control point regulating blood flow into a capillary bed Increase pressure in a capillary bed None of the above
- In microcirculation, the contraction of precapillary sphincters results in an : choose the correct option - increase in venule pressure -arteriovenous bypass -increase in blood flow velocity - increase in capillary volume - increase in capillary flow rateWhich statement is CORRECT concerning capillaries? The only site of nutrient, gas, and waste exchange Pre-capillary sphincters contract to increase capillary flow. Almost all capillaries are open at the same time. The walls of capillaries contain smooth muscle. Networks of capillaries are called capillary nets.Which of the following is NOT true of gas, nutrient, and fluid exchange between capillaries and body tissues? Blood pressure is higher entering than leaving the capillary Osmotic pressure is constant across the capillary Blood pressure is less in the capillary than in the tissuesExcess fluid from the exchange enters the lymphatic duct Blood enters the capillary from the arteriole
- Draw, label, and describe what is occurring in an EKG. Connect electrical activity to a mechanical actionTrue or false Blood pressure is a product of cardiac output and resistance. Blood pressure is lowest in the vena cava The pulse is felt at the large veins Arterioles are the most important vessels in regulation blood pressure. Veins and lymph vessels have valves Only arteries have smooth muscles Veins always carry deoxygenated blood.Blood flows from an area of low pressure to an area of high pressure. Blood flowing from one aorta into billions of capillaries decreases the velocity and pressure of the blood flow. Blood flow velocity is inversely related to cross-sectional area.
- Which of the following statements best describes systolic blood pressure? Systolic blood pressure depends upon the force of the heart contractions - the stronger the contractions the higher the systolic pressure will be. Systolic blood pressure depends on how tightly the cuff of the sphygmomanometer is tightened. Systolic blood pressure depends upon the resistance of the blood vessels - the greater the resistance to blood flow the higher the systolic pressure will be. Systolic blood pressure depends upon the force and frequency of the heart contractions - the stronger and more frequent the contractions the higher the systolic pressure will be.Which of the following describes normal blood flow through a capillary bed? arterioles, arteries, venules, capillaries arteries, arterioles, capillaries, venules, veins veins, venules, capillaries, arteries, arterioles capillaries, arterioles, venules, arteries, veinsDuring Diastole, pressure inside the ventricle drops to near zero, but pressure inside the aorta only decreases to 80 mmHg. Pressure remains elevated in the aorta because The walls are elastic Blood is flowing so fast Smooth muscles are actively contracting There is resistance to flow