Understanding Vascular Resistance

What is the relationship between blood viscosity and vascular resistance?

• As viscosity increases, resistance increases.

• As viscosity increases, resistance decreases.

• Viscosity and resistance are unrelated.

• Viscosity decreases resistance.

What is the effect of polycythemia on blood viscosity?

• It decreases viscosity.

• It increases viscosity.

• It has no effect on viscosity.

• It stabilizes viscosity.

How does the length of a blood vessel affect its resistance?

• Length does not affect resistance.

• Longer vessels have more resistance.

• Shorter vessels have more resistance.

• Longer vessels have less resistance.

How does blood flow change when a vessel's radius decreases?

• Blood flow decreases.

• Blood flow increases.

• Blood flow doubles.

• Blood flow remains constant.

Which factor can change the radius of blood vessels from minute to minute?

• Blood pressure

• Blood vessel length

• Blood viscosity

• Blood vessel radius

What happens to resistance when the radius of a blood vessel is halved?

• Resistance remains the same.

• Resistance is quadrupled.

• Resistance is doubled.

• Resistance increases 16 times.

How is blood flow related to resistance and pressure?

• Flow is inversely proportional to pressure.

• Flow is inversely proportional to both pressure and resistance.

• Flow is directly proportional to resistance.

• Flow is directly proportional to pressure and inversely to resistance.

In a series of blood vessels, how is total resistance calculated?

• By multiplying individual resistances.

• By adding individual resistances.

• By dividing individual resistances.

• By subtracting individual resistances.

What is the key difference between serial and parallel resistance?

• Serial resistance is always less than any individual resistance.

• Parallel resistance is always more than any individual resistance.

• Parallel resistance is the sum of individual resistances.

• Serial resistance is the sum of individual resistances.

What is the resistance of a system with parallel vessels compared to individual components?

• Always more than any component

• Always less than any component

• Equal to the largest component

• Equal to the smallest component