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The atrioventricular node starts each heart beat and is often called the pacemaker of the heart for that reason.

The ________ receives blood from the superior vena cava and the inferior vena cava.

The regulation of blood flow by local mechanisms within a capillary bed is called

The right atrium receives blood from the

The ________ is the difference between the resting and maximal cardiac output.

Abnormally slow depolarization of the ventricles would most change the shape of the ________ in an ECG tracing.

Oxygen is added to blood as it flows through the ________ circuit.

Which of the following are involved in the pulmonary circuit?

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following questions: What volume is labeled “G” on the graph?

In response to hemorrhage, there is