Free Practice Quiz Question List

3 Fluids in Biological Systems Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 Fluids in Biological Systems, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

If the pressure difference across a pathway stays the same while its resistance increases, fluid flow through the pathway decreases.

A
True
B
False

Choose one

1 point

Which quantity describes how readily the lungs and chest wall expand in response to a pressure change?

A
The pressure needed to maintain airflow
B
The change in lung volume divided by the change in pressure
C
The resistance of the airways to airflow
D
The volume of air moved in one breath

True or false

1 point

At a branching point in a flow pathway, the incoming volumetric flow equals the sum of the outgoing volumetric flows.

A
True
B
False

Fill in the blank

1 point

For incompressible flow, the continuity principle gives volumetric flow as cross-sectional area multiplied by .

Choose one

1 point

Several pathways with resistance are connected in parallel. What happens to the total resistance compared with the resistance of any one branch?

A
Total resistance becomes greater than the resistance of every branch
B
Total resistance becomes lower than the resistance of any one branch
C
Total resistance is always equal to the resistance of the shortest branch
D
Total resistance is unaffected by adding another pathway

Written response

1 point

An incompressible fluid flows through a section with cross-sectional area $0.5\,\mathrm{cm}^2$ and average speed $4\,\mathrm{cm/s}$ . What is the volumetric flow rate?

Choose one

1 point

For steady laminar flow of a Newtonian fluid through a rigid cylindrical tube, what happens to resistance if the tube length doubles while its radius and the fluid viscosity stay unchanged?

A
Resistance falls to half its original value
B
Resistance stays the same
C
Resistance doubles
D
Resistance increases sixteenfold

Fill in the blank

1 point

In the Starling equation, $\pi_c$ and $\pi_i$ represent capillary and interstitial .

Choose all

1 point

In an ideal cylindrical tube, the radius narrows while the pressure difference remains unchanged. Which outcomes follow from the Poiseuille model? Select all correct choices.

A
Resistance increases
B
Resistance decreases
C
Flow decreases if the pressure difference stays the same
D
Flow increases if the pressure difference stays the same

Written response

1 point

In which vascular network is average blood speed relatively low because flow is distributed across a large total cross-sectional area?

Choose all

1 point

Which changes can contribute to edema by causing fluid filtration to exceed its removal from tissues? Select all correct choices.

A
Elevated capillary pressure
B
Reduced capillary pressure
C
Increased permeability of the barrier
D
Impaired lymphatic drainage

Open ended

1 point

Explain how the endothelial glycocalyx and lymphatic drainage affect fluid exchange between blood and tissues. Why do these features make the simplified model of routine filtration at one end of a capillary and reabsorption at the other incomplete?

Choose one

1 point

Which situation matches the assumptions under which the Hagen–Poiseuille relation is presented as an ideal model?

A
Pulsatile flow of a non-Newtonian fluid through elastic branching vessels
B
Steady laminar flow of a Newtonian fluid through a rigid cylindrical tube
C
Turbulent flow through a tube whose radius changes continuously
D
Steady flow through any biological vessel, regardless of its geometry or fluid properties

Choose one

1 point

In a pathway where resistance remains constant, what happens to volumetric flow if the pressure difference across it doubles?

A
Flow falls to half its original value.
B
Flow doubles.
C
Flow remains unchanged.
D
Flow increases fourfold.

Choose one

1 point

During inhalation, which pressure change causes air to move into the lungs?

A
Pressure inside the lungs rises above atmospheric pressure, pushing air inward.
B
Pressure inside the lungs matches atmospheric pressure, drawing air inward.
C
Pressure inside the lungs falls below atmospheric pressure, drawing air inward.
D
Atmospheric pressure falls below pressure inside the lungs, drawing air inward.

Choose one

1 point

Why is average blood speed relatively low across the many capillaries in a tissue, and how does this support exchange?

A
Their large total cross-sectional area is associated with relatively low average blood speed, allowing time for exchange.
B
Their small total cross-sectional area makes blood move slowly enough for exchange.
C
Their large total cross-sectional area raises average blood speed and limits exchange.
D
Their low resistance stops blood flow so exchange can occur.

Choose one

1 point

At a vessel branch, incoming flow is $12$ mL/s. One outgoing branch carries $5$ mL/s. What is the flow in the other outgoing branch?

A
5 mL/s
B
6 mL/s
C
17 mL/s
D
7 mL/s

True or false

1 point

Under many steady conditions, lymphatic drainage is a major route for returning filtered fluid to the blood, so the classic model of routine filtration at one end of a capillary and reabsorption at the other is an oversimplification.

A
True
B
False

Written response

1 point

A lung volume increases by $0.6$ L when pressure increases by $0.2$ kPa. Using compliance as change in volume divided by change in pressure, calculate the compliance.

Written response

1 point

Two vascular segments are connected in series and have resistances of 3 and 5 resistance units. What is their combined resistance? Enter the numeric value only; the answer is in resistance units.