# Physio 9.0 Cardio Lab Report

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Physio 9.0 Cardio Lab Report

Activity 1 Questions:

1. Explain how the body establishes a pressure gradient for fluid flow.

Pressure gradient is the flow rate of a liquid through a pipe. This is directly proportional to the difference between the pressures at the two ends of the pipe and inversely proportional to the pip's resistance. The pressure gradient is directly dependent upon blood vessel radius which essentially controls blood flow. The bigger the blood vessel radius, the more blood flow or fluid flow. The smaller blood vessel radius, the lesson blood or fluid flow.

2. Explain the effect that the flow tube radius change had on flow rate. How well did the results compare with your prediction?

Flow tube radius change has a direct effect on flow rate. As evidenced in this lab, when flow tube radius was increased, the flow rate was also increased. They are directly proportional. As evidenced from the text, when flow tube radius increases in a blood vessel, the flow rate is much more free flowing and flows a lot quicker as the radius is increased. When starting with 1.5mm of radius, the flow was very slow, yet when increased to 2mm, 3mm, and eventually to 5mm, the flow within the blood vessel incrementally increased.

3. Describe the effect that radius changes have on the laminar flow of a fluid.

Laminar Flow is defined as the free-flowing blood in the middle of the vessel. Radius change is directly proportional on laminar flow. In a constricted vessel, proportionately more blood is in contact with the vessel wall and there is less laminar flow, significantly diminishing the rate of blood flow in the vessel, yet if the vessel is more dilated, or the radius is increased, more blood flow is able to get in, thus increasing the blood flow. The bigger the radius, the more laminar flow of fluid.

4. Why do you think the plot was not linear? (Hint: look at the relationship of the variables in the equation). How well did the results compare

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