Final answer:
The heart operates as a two-pump system, with the right side pumping blood through the lungs and the left side pumping it through the rest of the body. In hydraulic systems, a second pump may be activated by control systems when more pressure is needed.
Step-by-step explanation:
In a two-pump system, like the human heart, operation is managed through coordinated contractions that maintain continuous blood flow. The heart's right side functions as a pump that forces blood through the lungs for oxygenation, while the left side acts as a second pump, sending oxygen-rich blood through the rest of the body. Activation of the second pump, the left side of the heart, is triggered by the completion of the right side's pump cycle, which pushes blood into the left side, resulting in increased pressure that causes the left ventricle to contract and propel the blood into the systemic circulation.
In hydraulic systems, such as those found in power brakes or construction equipment like bulldozers, the operation can involve a motorized pump that takes on the primary work of moving fluid through the system. The activation of a second pump might be managed by pressure sensors and control systems that trigger the second pump when additional fluid pressure or volume is needed.