Blood Vessels and Circulatio1

Blood Vessels and Circulatio1 - pressure cuff Pressure and...

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Blood Vessels and Circulation Veins of the Abdomen and Pelvis o Posterior abdominal wall veins join the azygos veins. o Veins from the kidneys, adrenal glands, and gonads directly enter the inferior vena cava. o Veins from the stomach, intestines, spleen, and pancreas connect with the hepatic portal vein, which transports blood to the liver for processing. The hepatic veins from the liver join the inferior vena cava. Veins of the Lower Limbs o The deep veins course with the deep arteries and have similar names. o The superficial veins are the small and great saphenous veins. The Physiology of Circulation Blood Pressure o Blood pressure is a measure of the force exerted by blood against the blood vessel wall. Blood pressure moves blood through vessels. o Blood pressure can be measured by listening for Korotkoff sounds produced as blood flows through arteries partially constricted by a blood
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Unformatted text preview: pressure cuff. Pressure and Resistance o Blood pressure fluctuates between 120 mm Hg (systolic) and 80 mm Hg (diastolic) in the aorta. If constriction of blood vessels occurs, resistance to blood flow increases, and blood flow decreases. Pulse Pressure o Pulse pressure is the difference between systolic and diastolic pressure. Pulse pressure increases when stroke volume increases. o A pulse can be detected when large arteries are near the surface of the body. Capillary Exchange o Most exchange across the wall of the capillary is by diffusion. o Blood pressure, capillary permeability, and osmosis affect movement of fluid across the wall of the capillaries. There is a net movement of fluid from the blood into the tissues. The fluid gained by the tissues is removed by the lymphatic system....
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