26 Questions
Which of the following factors determines the amount of flow in a system?
The size of the energy gradient
What is the driving force for the flow of a substance in a system?
The energy gradient
What is the relationship between the energy gradient and the flow in a system?
Directly proportional
Which law describes the flow of gases and fluids through 'large tubes'?
Poiseuille's law
What law determines the rate of flow through a tube?
Poiseuille's law
What parameter causes the flow of gas or liquid from one point to another in a tube?
Hydrostatic pressure
What is the most likely cause of Robert's shortness of breath?
His NYHA stage II heart failure
Which of the following best explains Robert's foot swelling?
His NYHA stage II heart failure
Which law describes the flow of fluid through rigid, simply-shaped tubes with non-turbulent flow?
Poiseuille's law
Which factor is the most important determinant of resistance in Poiseuille's law?
Tube radius
Which law quantifies how the rate of diffusion is affected by concentration gradient, membrane surface area, and membrane thickness?
Fick's law
Which factor affects the flow/flux of solutes through capillaries, substances through cell membranes, and oxygen and carbon dioxide from alveolus to blood?
All of the above
Which law describes the movement of a solute or a gas in a gas mixture from an area of high concentration to low concentration across a barrier?
Fick's law
Which factor increases the constant in Fick's law?
Increase in permeability
According to Fick's law, the rate of diffusion depends on all of the following factors except....
Hydrostatic pressure across membranes
Which of the following is true about cells specialized for transporting large amounts of solute?
They have a larger surface area to volume ratio
Which of the following is true about diffusion in physiological situations?
Diffusion failure is common in disease
According to Ohm's law, the current (I) across a membrane is defined by which equation?
I = V / R
Which of the following is true about resistance in the context of Ohm's law?
Resistance decreases with more channels for a charged particle
According to Ohm's law, the current (I) decreases when which of the following factors increases?
Resistance (R)
Which equation represents Poiseuille's law for flow through a tube?
$F = (P1 - P2) \cdot \pi r^4 / 8 \mu l$
What does hydrostatic pressure represent in Poiseuille's law?
The force that a substance exerts on the walls of a tube/vessel
What happens to flow when the radius of the tube/vessel increases?
Flow increases
What happens to flow when the length of the tube/vessel increases?
Flow decreases
What happens to flow when the viscosity of the fluid increases?
Flow decreases
How does resistance change if the radius of the tube/vessel decreases by half?
Resistance increases by a factor of 4
Test your understanding of Poiseuille's law and its limitations with this quiz. Explore the caveats associated with this law, including its accuracy for different tube shapes, fluid flow conditions, and flexibility of tubes. Discover the impact of these variations on the calculation of resistance and the role of tube radius.
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