Glomerular Filtration : The Major Function Of The Glomerulus

Blood pressure and water pressure (osmotic) are responsible for creating the movement of fluid across the capillary wall.

Consequently, the efferent arteriole, which filters blood away from the glomerulus, is tinier in diameter than the afferent arteriole, which carries blood into each glomerulus. This puts blood under high pressure in the glomerulus; thus it forces tiny molecules and liquid out of the capillary and into the Bowman’s capsule. Soon afterwards, the tiny and liquid molecules cross the epithelium of the Bowman’s capsule, the basement membrane and capillary wall in order to get into the Bowman’s capsule and to arrive in the nephron tubules. The consequence of this is that the filtrate (the tiny and liquid molecules) pass along the remainder of the nephron and helpful substances are reabsorbed along the route. Last of all, “the filtrate flows through the collecting duct and passes out of the kidney along the ureter” as mentioned by (Parson’s, R: p128).

2. Which of the lab values gives you information about how Mrs. Burroughs’ kidneys are functioning?

1. What two parameters are responsible for creating the movement (filtration and reabsorption) of fluid across the capillary wall?

The difference is that along with large molecules, living cells prevent molecules with positive charges and solubility. This is not representing in dialysis tubing, and is only found in living cells because the tubing is only based on molecular size (98). When referring the rate of diffusion, the concentration gradient influences the diffusion rate, based on the factors of temperature. The ability for molecules diffuse from high to low concentrations primarily depends on the concentration gradient between the two areas.(96-99). My hypothesis for the study is that in the hypotonic, hypertonic, and isotonic solutions, the direction and rate of osmosis will determine based on the concentration inside the dialysis tubing. My prediction is that if the solution is hypotonic the results will decrease, if the solution is hypertonic the results will increase and if the solution is isotonic the solution will vary and or remain constant.

What two parameters are responsible for creating the movement (filtration and reabsorption) of fluid across the capillary wall?

One dialysis tube was submerged in each beaker. Osmosis was allowed to occur for 5 minutes and then all of the tubes were removed from the water. The tubes were dried off and measured on the triple beam scale. The mass was taken and recorded for all three tubes. I then placed the tubes back into their respective solutions. The process was repeated four times for each tube in 5 minute increments, and then the materials were disposed of. The rate of diffusion of water in each solution was

Secondly, osmosis was to be observed to gain a proper understanding of how the principal of dialysis functions.

of the water. The osmolality of the water leaving the tube of Henle is lower than the

movement of water in tissues and maintain the fluidity of mucus and other secretions [3].

There are also a few tests that will show whether or not the kidneys are filtering the body’s fluids as they should. A simple urinalysis can be done to detect protein or blood in the urine. This will alert the medical professionals to a possible problem with the proper functioning of the kidneys. There are also Blood Urea Nitrogen (BUN), creatinine, and glomerular filtration rate (GFR) tests that will measure the

Ultra filtration: Ultra filtration results when there is an osmotic gradient or pressure gradient across the membrane. In PD excess fluid is removed by increasing the osmolality of the dialysate with the addition of glucose. In HD , the gradient is created by increasing pressure in the blood compartment(positive pressure)t ore decreasing pressure in the dialysate compartment(negative pressure). Extracellular fluid moves in to the dialysate because of the pressure gradient. The excess fluid is removed by creating a pressure differential between the blood and the dialysate solution.

2.   How could you adjust the afferent or efferent radius to compensate for the effect of the reduced pressure on glomerular filtration rate and urine volume?  Use the simulation to determine your answer.

Six plastic cups were obtained and labeled 0.2 M, 0.4 M, 0.6 M, 0.8 M, and 1.0 M. Next, each of the six dialysis tubes were knotted on one end and filled with the sucrose samples, and then tied off. These samples were then dried by patting with a paper towel, weighed and placed into their corresponding cups. The mass of each sample was recorded in table 2 on the data sheet. Each cup was then

A negative relationship between the RBC concentration and LIM voltage is observed, when more blood is added to the isotonic saline solution, blood concentration increased, therefore the protein concentration become greater in the solution. The greater concentration of protein in the solution the more light is scattered. The intensity of the scattered light increased, resulted in a lower voltage was detected by the LIM device. Thus resulted in a trend of decreasing voltage with an increasing blood concentration. Figure 1 indicates that the output of the LIM is linear. RBCs were added in an isotonic solution, which means there will be no net water movement between the saline solution and the RBCs. When the blood concentration increased the voltage is decreased, therefore, an inversely proportional relationship is observed between the two variables (y = -0.1069x + 0.0885). Hence, the concentration of blood in the unknown solution is 12.05 µLml-1.