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John BIO 141 – A portal system

01 / 10 / 2021 Projects

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John BIO 141 – A portal system

1. A portal systemincludes a functional end artery that makes an arterial anastomosis.is a simple circulatory system with an areriovenous anastomosis.is one in which blood flows through two capillary beds before being sent back to the heart.is one in which circulation to a large organ involves only one artery and one main (portal) vein.is one in which multiple arteries converge on one organ or body region.2. Oxygen and carbon dioxiode are transported between the blood and interstitial fluid by way ofexocytosis and endocytosis by endothelial cells.pinocytosis using fluid-filled vesicles.diffusion from areas of higher concentration to lower concentration.active transport (using ATP) by protein carriers of endothelial cells.3. Some large molecules, such as fatty acids, are transported between capillaries and tissues by vesicular transport.True False4. Which statement accurately compares filtration and reabsorption?Filtration is driven by concentration gradients, whereas reabsorption depends on hydrostatic pressure.Filtration involves bulk flow of fluid out of the blood, whereas reabsorption is bulk flow back into the blood.Filtration happens at the venule end of a capillary bed and reabsorption happens in feeder arterioles.The direction of filtration can be either into or out of the blood, but reabsorption always involves fluids entering the blood.5. Blood colloid osmotic pressure is largely due tothe proteins in the blood, and it promotes reabsorption. the high amount of water in the blood, and it promotes diffusion out of the capillaries. the proteins in the blood, and it promotes filtration. the pressure generated by the heart, and it favors osmosis into the arteriole end of the capillary bed. the high amount of water in the blood, and it promotes filtration from arterioles.6.Which statement is accurate?Filtration dominates at the arterial end of a capillary bed, and is driven by osmotic pressure.Filtration dominates at the arterial end of a capillary bed, and is driven by hydrostatic pressure.Filtration dominates at the venous end of a capillary bed, and is driven by osmotic pressure.Filtration dominates at the venous end of a capillary bed, and is driven by hydrostatic pressure. 7.As blood moves from the arterial end to the venous end of a capillary, net filtration pressureincreases, as blood hydrostatic pressure rises.increases, as blood colloid osmotic pressure rises.decreases, as blood hydrostatic pressure decreases.decreases, as blood colloid osmotic pressure decreases.remains the same, as rises in blood osmotic pressure are offset by declines in tissue osmotic pressure.



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