Lab Quiz

Cardiovascular Dynamics Lab Quiz

This activity contains 25 questions.

	Refer to Activity 1: Studying the Effect of Flow Tube Radius on Fluid Flow. What happened to fluid flow as the radius of the flow tube was increased?   The fluid flow stopped. There was no change in the fluid flow. The fluid flow decreased. The fluid flow increased.

	Because fluid flow is proportional to the fourth power of the radius, ____________ changes in the tube radius cause _____________ changes in fluid flow.   small; small large; small large; large small; large

	Which of the following does NOT describe how our bodies control blood flow?   By contracting or relaxing the smooth muscle within blood vessel walls. By increasing blood vessel radius. By decreasing blood vessel radius. By increasing blood pressure.

	Refer to Activity 2: Studying the Effect of Viscosity on Fluid Flow. How does fluid flow change as viscosity is modified?   Fluid flow increases as viscosity is increased. Fluid flow decreases as viscosity is increased. Fluid flow is not affected by viscosity. Fluid flow is directly proportional to viscosity.

	How does the effect of viscosity compare with the effect of radius on fluid flow?   The effect of viscosity on fluid flow is equal to the effect of vessel radius on fluid flow. Neither viscosity nor vessel radius have any effect on blood flow. Viscosity has a greater effect on fluid flow than vessel radius. Vessel radius has a greater effect on fluid flow than viscosity.

	What would happen to the blood flow rate if the number of blood cells were to increase?   Blood flow rate would remain constant. Blood flow rate would decrease. An increase in the number of blood cells would not affect the blood flow rate. Blood flow rate would increase.

	Refer to Activity 3: Studying the Effects of Flow Tube Length on Fluid Flow. How does the flow tube length affect fluid flow?   Increasing the flow tube length increases the fluid flow rate. Increasing the flow tube length decreases the fluid flow rate. Increasing the flow tube length has no effect on fluid flow rate. Flow tube length is directly proportional to fluid flow rate.

	Refer to Activity 4: Studying the Effect of Pressure on Fluid Flow. How does driving pressure affect fluid flow?   A decrease in driving pressure results in increased fluid flow. An increase in driving pressure results in decreased fluid flow. Changes in driving pressure do not have any effect on fluid flow. An increase in driving pressure results in increased fluid flow.

	How does the plot in Activity 4 differ from the plots you have seen for the previous activities?   It is parabolic. It is linear. It is a flat line. It shows an inverse relationship.

	Refer to Activity 5: Studying the Effect of Radius on Pump Activity. Which of the descriptions best explains why this graph differs from the radius plot in Activities 1-4 (Vessel Resistance)?   It differs because only the inflow of the pump was changed. It differs because only the flow tube length was changed. It differs because only the vessel radius was changed. It differs because only the outflow of the pump was changed.

	As the right flow tube radius is increased, fluid flow rate ___________. This is analogous to ___________ of blood vessels in the human body.   increases; dilation increases; constriction decreases; dilation decreases; constriction

	What would happen to the flow rate and the pump rate if the left flow tube radius is increased?   The flow rate in the pump would increase, thus decreasing the pump rate. The flow rate in the pump would increase, thus increasing the pump rate. The flow rate in the pump would decrease, thus increasing the pump rate. The flow rate in the pump would decrease, thus decreasing the pump rate.

	Refer to Activity 6: Studying the Effect of Stroke Volume on Pump Activity. What happened to the pump's rate as its stroke volume was increased?   As the stroke volume increased, the pump rate slowed. As the stroke volume increased, the pump rate stayed constant. As the stroke volume increased, the pump rate increased. As the stroke volume decreased, the pump rate stopped.

	Applying the simulation outcomes to the human heart, which of the following would be the likely result of increasing the stroke volume on cardiac output?   With a constant flow rate, increasing stroke volume will have no effect on cardiac output. With a constant flow rate, increasing stroke volume will increase cardiac output. With a constant flow rate, increasing stroke volume will cause cardiac output to stop. With a constant flow rate, increasing stroke volume will decrease cardiac output.

	What will happen to the pressure in the pump during filling if the valve in the right flow tube became leaky?   The pressure will decrease. The pressure will increase. The pressure will remain constant. There will be no pressure in the pump.

	What would occur if the aortic valve became slightly constricted?   Less force per contraction would be needed to deliver the same amount of blood. The heart would compensate by delivering the amount of blood that correlates with capable pressure output. Greater force per contraction would be needed to deliver the same amount of blood. The heart would lower the force of the contractions but the amount of blood delivered would remain the same.

	Refer to Activity 7: Studying Combined Effects. How is the flow rate affected when the right flow tube radius is kept constant at 3.0mm, and the left flow tube radius is modified either up or down?   The pump filling time will be affected, which will in turn affect the flow rate. There will be no effect.

	What happens to the flow and pump rate when you keep the end stroke volume constant and alter the start volume to manipulate stroke volume?   The pump rate will increase as the stroke volume increases to maintain the same flow rate. The pump rate will increase as the stroke volume decreases to maintain the same flow rate. The pump rate will decrease as the stroke volume decreases to maintain the same flow rate. The pump rate will increase as the stroke volume decreases to increase the flow rate.

	If the left beaker pressure is decreased to 10 mm Hg, how is the pump-filling time affected?   It greatly decreases the time required to fill the pump. It slightly increases the time required to fill the pump. It slightly decreases the time required to fill the pump. It greatly increases the time required to fill the pump.

	What happens to the pump rate if the filling time is shortened?   The pump's rate increases. The pump's rate remains unchanged. The pump's rate decreases.

	What happens to fluid flow when the right beaker pressure equals the pump pressure?   Fluid flow remains the same. Fluid flow decreases. Fluid flow stops. Fluid flow increases.

	Refer to Activity 8: Studying Compensation. When the right flow tube radius is decreased, what happens to flow rate?   The flow rate decreases. The flow rate remains the same. The flow rate increases.

	If the right flow tube radius were decreased to a 2.5 mm radius, which of the following would NOT prevent the flow rate from decreasing?   Decreasing the pump's pressure Increasing the radius of the left flow tube to decrease the pump's filling time. Decreasing the pressure in the right beaker Increasing the pump's pressure

	Decreasing the right flow tube radius is similar to partial _____________ of the aortic valve or __________ resistance in the arterial system.   leakage ; increased blockage ; decreased leakage ; decreased blockage ; increased

	In order to increase or decrease blood flow to a particular body system (e.g. digestive), what would be the best variable to adjust?   The radius of the blood vessels feeding them. The radius of the blood vessels emptying them. The overall peripheral resistance. The pressure through the blood vessels.

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