58, For each of the following pressures associated with glomerular filtration, w

Question

58, For each of the following pressures associated with glomerular filtration, write in the normal pressure in mm Hg, and check the appropriate box to indicate whether the pressure is an outward pressure (pushes or draws materials out of the blood) or an inward pressure (prevents materials from leaving the blood or pushes them back into the blood) Pressure Value (mm Outward Pressure? Inward Pressure? Hg) Pressure Hydrostatic Pressure | 60 of Blood Colloid Osmotic Pressure of Blood Hydrostatic Pressureg of Filtrate 59, Why doesn't colloid osmotic pressure of the filtrate (capsular fluid) normally impact glomerular filtration pressure? 60, Define net filtration pressure. What is the value in mm Hg for net filtration pressure under normal conditions? Which specific pressure has the greatest impact on net filtration pressure? 61. Why is it that the diameter of the afferent (primarily) and efferent arterioles has such an effect on hydrostatic pressure of the glomerular blood? What effect does dilation of the afferent arteriole have on hydrostatic pressure of the glomerular blood? How about constriction? 15

Explanation / Answer

58. the hydrostatic pressure will move the blood into the capillary but moves the fluid out of the pores into the interstitial space. so this is outward pressure

colloid osmotic pressure of blood also known as the oncotic pressure tends to pull fluid into the capillaries. so this is an inward pressure.

hydrostatic pressure of filtrate pushes the filtrate out of glomerulus. this have higher effect than the oncotic pressure. this is an outward pressure.

59. the force of the hydrostatic pressure pushing filtrate out of the glomerulus is greater than the force of oncotic pressure or colloid osmotic pressure that draws it in. that is why colloid osmotic pressure doesnt impact glomerular filtrate pressure.

60. it is the interaction between the hydrostatic pressure and the oncotic presure, driving fluid out of capillary. it is the difference betwwen capillary hydrostatic pressure and blood colloid osmotic pressure.

arterial end net filteration pressure is +10mmhg

mid capillary filtration pressure is 0mmHg

venous end net filtration pressure is -7mmHg

capillary hydrostatic pressure have greater effect on net filtration pressure.

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