Figure 20-2 Cardiac Cycle

Use Figure 20-2 to answer the following questions:
-What is occurring in the left atrium at the circle labeled "2" on the graph?

Question

Figure 20-2 Cardiac Cycle
 
Use Figure 20-2 to answer the following questions:
-What is occurring in the left atrium at the circle labeled "2" on the graph?

Quizplus · Accepted Answer

At the point labeled "2" on a typical cardiac cycle graph, the left atrium is contracting, or in systole, to push blood into the left ventricle. This is the phase where the atrial pressure peaks as it works to fill the ventricle.