As blood vessel length increases without a change in vessel diameter, what changes occur?

Question

BlackTom AI · Accepted Answer

The question asks what happens to hemodynamics when blood vessel length increases while diameter remains constant.
Option 1: Friction decreases with no change in flow or resistance. This is not supported by the physics of longer tubes; increasing length raises resistance and typically affects flow, not reducing friction independently. So this is inaccurate.
Option 2: Resistance increases and flow decreases. This aligns with the principle that resistance in a long, narrow tube grows with length (Poiseuille's law), and with a higher resistance at the same pressure gradient, flow must decline. This option correctly captures the expected relationship.
Option 3: Both resistance and flow increase. Increased length should not cause flow to rise; as resistance goes up, flow tends to go down under a given driving pressure, so this is incorrect.
Option 4: Resistance increases with no change in flow or friction. While resistance does increase with length, flow does not stay unchanged under a constant pressure gradient; it typically decreases. Also, friction (shear) is not guaranteed to remain unchanged with increased length, so this statement is flawed.
Option 5: Flow decreases with no change in resistance or friction. Since resistance increases with greater length, it is inconsistent to claim resistance remains unchanged; therefore this option is false.
In summary, the only option that coherently describes the direct effect of increased length at constant diameter—higher resistance accompanied by reduced flow—is Option 2: Resistance increases and flow decreases.

As blood vessel length increases without a change in vessel diameter, what changes occur?单项选择题

类似问题

Question at position 45 Which of the following factors can contribute to turbulence in blood flow?Decreased blood velocityIncreased arterial complianceHigh blood viscosityAbrupt changes in vessel geometry

Which of the following statements is true regarding cross sectional area and velocity of blood flow?

The gradient of the straight line, which passes through (3, 5) and (5, 3) is:

Calculate the De Broglie wavelength of an electron moving with a velocity of [math: 7.26×106ms−1] .Give your answer in standard form to 2 decimal places without units.Example format: [math: 1.23×10−45N] should be written as [ 1.23e-45 ]

A 0.18 m section of wire is placed in a uniform magnetic field of 0.40 T. The wire carries a current of 1.70 A. The angle between the magnetic field and the wire is [math: 67.0∘]. What is the magnitude of the force experienced by the wire?

Two point charges, [math: q1=+7μC] and [math: q2=−7μC] , are placed 0.21 m apart in a vacuum. What is the magnitude of the net electric field, at the midpoint between the two charges?*Note: [math: 1.23×104NC−1] is written as 1.23e4 N/C

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单