Quiz on Pressure and Blood Flow Concepts

What is the unit of measurement for pressure?

• mmHg

• liters

• grams

• meters

What does the pressure gradient (∆ P) represent?

• Pressure at a single point

• Total pressure in a system

• Difference between two locations

• Pressure exerted by gravity

What is hydrostatic pressure caused by?

• Gravity on a fluid-filled system

• Friction in blood vessels

• Temperature changes

• Chemical reactions

How much does pressure rise for each 1 mm below the surface?

• 1 mmHg

• 10 mmHg

• 13.6 mmHg

• 0.74 mmHg

What is the formula for hydrostatic pressure?

• P = ρgh

• P = mgh

• P = F/A

• P = V/t

What is the compliance of a vessel?

• Extent to which it can expand per unit pressure

• Rate of blood flow through it

• Resistance to blood flow

• Total volume of blood it can hold

Which factor decreases the compliance of blood vessels?

• Decreased blood pressure

• Increased vessel radius

• Decreased blood viscosity

• Increased sympathetic outflow

What does the Poiseuille equation describe?

• Pressure in the circulatory system

• Blood flow rate

• Factors determining resistance in blood vessels

• Volume of blood in veins

What happens to blood flow if the radius of a vessel is halved?

• Decreases to 1/4 of its previous value

• Remains the same

• Increases by 4 times

• Decreases to 1/16 of its previous value

What is laminar flow?

• Flow in layers

• Flow at high velocities

• Flow in a straight line

• Flow with turbulence