David Diaz Lab Partners: Steven V Biology II Lab: Intro to Molecules, Cells, & Genes-Mon. 12:45-3:20 Lab: Osmosis Due: March 3, 2016 Purpose: The purpose of this lab is for the students to understand and comprehend the act of osmosis throughout the cells in the human body. It was also conducted to understand the diffusion, the movement of molecules (usually water when dealing with osmosis) across a membrane. Concentration was also discussed as the amount of a substance in a particular volume or space. Predictions: None were created for this lab. Methods: Exercise 1 deals with pressure and equilibrium. It was a section, which was, used t get students used to creating a cell with equal and unequal pressure in and out of the cell. It helped students realized the questions of what about pressure in and out of the cell, and what the outcome of this influx would be. Keeping the cell in equilibrium was also learned by the amount of pressure put upon the system membrane. Exercise 2 deals with osmotic pressure. Where water is used as the solvent within the cell. Laos the students understood that in this section osmosis is the diffusion of water across a semi-permeable membrane. Also it was learned that if water molecules diffuse across a membrane into a cell, the pressure of the added molecules would cause the membrane to stretch and the cell to grow.
In exercise 3, osmosis plus concentration was viewed. Students were to explore the use of how to calculate the solute concentration to control osmosis. Students were to develop a formula for IV fluid, in which will the cell rupture, shrivel, or neither. In exercise 4, red blood cells were examined. It was needed that one was to apply what they have learned from the last sections. Concentration was calculated for the solute and water and hemoglobin molecules within and outside of the RBC. Pressure was viewed and evaluated to fit a certain amount upon the RBC. Also, Osmosis was viewed