12/6/19, 3 : 08 PM Results Page 1 of 7 Biol 216 Lab 8 Date / Time December 6, 2019 3:07 pm Biol 216 Lab 8 # Question Student Answer 1 Question #1: What is the difference between colloid osmotic pressure and capillary (hydrostatic) pressure? Colloid osmotic pressure is the pressure exerted by proteins in the blood plasma or interstitial fluid, whereas hydrostatic pressure is the force generated by the pressure of fluid within or outside of the capillary on the capillary wall. 2 Question #2: What is the importance of colloid osmotic pressure in regulating fluid balance? Because proteins located in the blood are unable to pass through the capillary endothelium, the colloid osmotic pressure within capillaries tend to draw water into the capillary vessels, thus maintaining and regulating the fluid balance. Proteins in the blood reduce the internal permeability of the capillary which allows less plasma fluid to exit the capillary-- generally though, colloid osmotic pressure is a major mechanism regulating fluid balance. 3 Question #3: What color is the solution in the tubing? blue 4 Question #4: What color is the solution in the beaker? redish-orange The fluid inside of the tubing turned dark blue due to the presence of
12/6/19, 3 : 08 PM Results Page 2 of 7 5 Question #5: Explain the significance of the colors in each solution. What does this tell us about the permeability of the dialysis tubing? iodine molecules that moved through the selectively permeable membrane of the dialysis tubing from the beaker into the tubing, which caused the tubing to turn dark blue in color because of the presence of iodine now in combination with the starch. The beaker solution turned reddish- orange because of the presence of glucose molecules (in addition with the iodine molecules in the beaker solution) which moved through the selectively permeable dialysis tubing from inside the tubing to the beaker. The reddish-orange color indicates the presence of glucose in the beaker solution, while the dark blue color indicates the presence of iodine molecules in the tubing. As mentioned, the dialysis tubing is selectively permeable to substances-- molecules like glucose and iodine are small enough to be able to travel through but larger molecules like starch are unable to move through.
- Fall '19
- pH, peritubular capillaries