In this activity, we changed the pressure delivered by the left beaker. This is analogous to _______.

In this activity, we changed the pressure delivered by the left beaker. This is analogous to _______.

• A. increasing the force of contraction of the heart.
• B. decreasing blood vessel radius.
• C. increasing blood vessel length.
• D. decreasing systemic arterial pressure.

Answer: (A)

The main idea is how changing the driving pressure of the circulation affects arterial pressure. When the left ventricle contracts more forcefully, it generates a higher systolic pressure to push blood into the aorta, raising systemic arterial pressure. Changing the pressure delivered by the left beaker is analogous to increasing the heart’s force of contraction because both raise the source pressure that drives flow through the system. The other options describe changes in the path or volume flow, not the pressure source itself. Decreasing vessel radius or increasing vessel length alters resistance and the pressure drop along the vessels, not the initial pressure the heart (or pump) produces. Decreasing systemic arterial pressure lowers the overall pressure, opposite to dialing up the driving pressure.

The main idea is how changing the driving pressure of the circulation affects arterial pressure. When the left ventricle contracts more forcefully, it generates a higher systolic pressure to push blood into the aorta, raising systemic arterial pressure. Changing the pressure delivered by the left beaker is analogous to increasing the heart’s force of contraction because both raise the source pressure that drives flow through the system.

The other options describe changes in the path or volume flow, not the pressure source itself. Decreasing vessel radius or increasing vessel length alters resistance and the pressure drop along the vessels, not the initial pressure the heart (or pump) produces. Decreasing systemic arterial pressure lowers the overall pressure, opposite to dialing up the driving pressure.