10/9/21, 11:45 PM PhysioEx Exercise 1 Activity 3 PhysioEx Lab Report Exercise 1: Cell Transport Mechanisms and Permeability Activity 3: Simulating Osmotic Pressure Name: Date: 9 October 2021 Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1 Which of the following is true of osmosis? You correctly answered: It is a type of diﬀusion. 2 Which of the following occurs when a hypertonic solution is added to cells? You correctly answered: The cells shrink. 3 The variable that aﬀects osmotic pressure is You correctly answered: the concentration of nondiﬀusing solutes. 4 The net movement of water would be into the cell in a You correctly answered: hypotonic solution. Experiment Results Predict Questions + will have? 1 Predict Question 1: What eﬀect do you think increasing the Na Cl concentration Your answer: decreased osmotic pressure. 2 Predict Question 2: What do you think will be the pressure result of the current experimental conditions? Your answer: pressure above the left beaker. Stop & Think Questions 1 Why do you think there is no pressure change? You correctly answered: Sodium is able to diﬀuse through the pores. Why do you think there was no pressure change? 1/3 10/9/21, 11:45 PM PhysioEx Exercise 1 Activity 3 You correctly answered: There is no net movement of water because the solute concentrations are the same. Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1 If you double the concentration of a nondiﬀusible solute that is on one side of a membrane, the osmotic pressure will You correctly answered: double. 2 Which membrane did not allow Na Cl +to pass through? You correctly answered: 20 MWCO. 3 When a solute is able to diﬀuse through a membrane You correctly answered: equilibrium is reached. 4 Water diﬀuses You correctly answered: toward solutes. Review Sheet Results + 1 Explain the eﬀect that increasing the Na Cl concentration had on osmotic pressure and why it has this eﬀect. How well did the results compare with your prediction? Your answer: The results did not match my prediction because as the NaCl was increasing the osmotic pressure was also increasing. 2 Describe one way in which osmosis is similar to simple diﬀusion and one way in which it is diﬀerent. Your answer: Osmosis is similar to simple diﬀusion because it is always trying to reach equilibrium on both sides of the membrane. They can be see to diﬀer because osmosis uses water/ liquid only while diﬀusion uses things such as gases. 3 Solutes are sometimes measured in milliosmoles. Explain the statement, “Water chases milliosmoles.” Your answer: The water is attracted to areas with high concentration. 2/3 10/9/21, 11:45 PM 4 The conditions were 9 mM PhysioEx Exercise 1 Activity 3 albumin in the left beaker and 10 mM glucose in the right beaker with the 200 MWCO membrane in place. Explain the results. How well did the results compare with your prediction? Your answer: The pressure in the left beaker increased because of the amount of pressure required for equalibrium of glucose. 3/3