Which statement accurately compares filtration and reabsorption?
A. Filtration is driven by concentration gradients, whereas reabsorption depends on hydrostatic pressure.
B. Filtration involves bulk flow of fluid out of the blood, whereas reabsorption is bulk flow back into the blood.
C. Filtration happens at the venule end of a capillary bed and reabsorption happens in feeder arterioles.
D. The direction of filtration can be either into or out of the blood, but reabsorption always involves fluids entering the blood.
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Question 2) Filtration and reabsorption are processes that involve water (a solvent) but not solutes.
Indicate whether this statement is true or false.
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Question 3) Some large molecules, such as fatty acids, are transported between capillaries and tissues by vesicular transport.
Indicate whether this statement is true or false.
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Question 4) Considering the bulk flow that occurs at capillary beds, the lymphatic system is needed to
A. reabsorb excess fluid from the interstitial fluid.
B. filter additional fluid to the interstitial fluid.
C. connect arterioles to venules and provide a shunt from the true capillaries.
D. regulate colloid osmotic pressure so that filtration levels do not decline.
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Question 5) As blood moves from the arterial end to the venous end of a capillary, net filtration pressure
A. increases, as blood hydrostatic pressure rises.
B. increases, as blood colloid osmotic pressure rises.
C. decreases, as blood hydrostatic pressure decreases.
D. decreases, as blood colloid osmotic pressure decreases.
E. remains the same, as rises in blood osmotic pressure are offset by declines in tissue osmotic pressure.
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Question 6) Circulation to the spleen demonstrates a(n)
A. simple pathway, as one artery delivers blood and one vein drains the organ.
B. simple pathway, as its two capillary beds are separated by a portal vein.
C. anastomosis, as one artery delivers blood and one vein drains the organ.
D. anastomosis, as its two capillary beds are separated by a portal vein.
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Question 7) Precapillary sphincters will
A. control blood flow into the true capillaries.
B. cause blood to flow directly from the metarteriole into the postcapillary venule.
C. open when the tissue needs nutrients.
D. close when the tissue's needs have been met.
E. All of the answers are correct.
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Question 8) Which is the most common type of capillary?
A. Fenestrated
B. Sinusoids
C. Continuous
D. Venules
E. Discontinuous
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Question 9) Which part of the circulatory system holds the largest amount of blood?
A. Pulmonary arteries
B. Pulmonary veins
C. Systemic arteries
D. Systemic veins
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Question 10) A venule becomes a vein when its diameter is greater than ____ micrometers.
A. 1
B. 10
C. 100
D. 1000
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