Exam 20: The Heart

Blood returning to the heart from the systemic circuit first enters the

Figure 20-1 The Heart Use Figure 20-1 to answer the following question: -Identify the structure labeled "19."

The relaxation phase of the cardiac cycle is called ________.

Drugs known as calcium channel blockers such as nifedipine can be used to

The amount of blood returning to the heart is the ________.

Oxygen is removed from blood as it flows through the ________ circuit.

Blood is supplied to the myocardium by

Tetanic muscle contractions don't occur in a normal cardiac muscle because

The earlike extension of the atrium is the

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

Figure 20-1 The Heart Use Figure 20-1 to answer the following question: -Identify the structure labeled "8."

Muscular ridges on the inner surface of the ventricles are called ________.

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following question: -What occurs at the area labeled "B" on the graph?

Cardiac muscle cells and skeletal muscle cells differ in a few ways.Which of the following is not one of them?

The foramen ovale in the fetal heart is located in the

Cardiac output is increased by

Most of the middle layer in the heart wall is composed of

A fine tubular wire mesh called a ________ may be inserted into a coronary vessel,holding it open.

The systolic part (both atrial and ventricular)of a cardiac cycle lasts on average

Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute.