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University of Toronto Scarborough
Biological Sciences
Stephen Reid

1 BGYC34; Second Assignment (2010) PhysioEx Lab 5 (Cardiovascular Dynamics) Due Date: Thursday February 4 Perform the experiments in PhysioEx lab 5 (Cardiovascular Dynamics) and submit a lab report according to the format and instructions below. There are a total of 25 marks. Introduction Write a brief (no more than 100 words) introduction that describes the goal of the experiments performed in this lab. (2 marks) Check the introduction to ensure that something has been written about the goals of the experiment and give the 2 marks. If this section is really short (i.e., just a single sentence) give only 1 mark. I have seen one paper that didn’t include an introduction at all (i.e., 0 marks) Methods Write a brief (no more than 300 words) methods section that describes the experiments performed in this lab. Describe the experimental preparation and the various manipulations that were performed. (2 marks) Check this section to see if it is a reasonable description of the experiments. If so, then give full marks. Reduce marks if you think the students have put no effort into this section or if it really short and uninformative. Results 1. Vessel Resistance Perform the experiments in this section. Include the 4 figures listed below. Either copy directly from the computer screen (i.e., by pressing “print screen” on your keyboard, pasting the copied screen into a program such as Power Point, cropping the image to give you just the view of the screen, re-sizing and then moving the figure into Word) or draw the trace by some other means (i.e., by hand or by recreating in another program). (2 marks) Give 2 marks if the following 4 graphs are present. They should look like the traces below with no variation. 1a. The Effect of Pressure on Blood Flow 2 1b. The Effect of Vessel Radius on Blood Flow 1c. The Effect of Viscosity on Blood Flow 1d. The Effect of Vessel Length on Blood Flow 3 2. Pump Mechanics Give 1 mark if the following graph that plots flow as a function of the right radius is present. 2a. Effect of Vessel Radius on Pump (1 mark) Give 1 mark if the following two graphs that plot flow and rate as a function of stroke volume are present. 2b. Effect of Stroke Volume on Pump (1 mark) 4 2c. Compensation (3 marks) List your three possible solutions to compensate for a reduction in blood flow caused by the reduction in the right flow tube radius. Present data either as a figure or in tabular form illustrating the effects of the three possible solutions that you came up with. There are a number of possible answers. Answers will vary. They could include: Decreasing the pressure in the right-hand beaker. Increasing the pressure in the middle beaker. Increasing the pressure in the left-hand beaker. Increasing the radius of the left flow tube. Increasing stroke volume (either by increasing the starting pump volume or decreasing the end pump volume) Give 1 mark for each proposed solution and associated graph or table for a total of 3 marks. 2d. Design Your Own Experiments (4 marks) Present data, either as a figure or in tabular form illustrating the effects, on flow rate, of: Decreasing t
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