Exam 18: The Cardiovascular System: the Heart

A patient takes a nitroglycerin tablet sublingually for chest pain.Nitroglycerin acts directly on smooth muscle,producing relaxation and vessel dilation.How would this relieve chest pain?

Figure 18.1 Using Figure 18.1, match the following: -Subendocardial conducting network (Purkinje fibers).

Figure 18.3 Using Figure 18.3, match the following: -Junctional rhythm.

The myocardium receives its blood supply from the coronary arteries.

Which of the events below does NOT occur when the semilunar valves are open?

Figure 18.3 Using Figure 18.3, match the following: -Ventricular fibrillation.

Figure 18.4 Using Figure 18.4, match the following: -Tricuspid valve.

Hemorrhage with a large loss of blood causes ________.

List the three vessels that bring oxygen-poor blood to the right atrium.Which regions of the body do they serve?

Match the following: -An abnormally slow heart rate.

Select the correct statement about the function of myocardial cells.

The foramen ovale ________.

When does the period of atrial repolarization occur?

If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells,________.

Match the following: -Death of heart muscle cells.

Match the following: -Prevents backflow into the left atrium.

During exercise,which of the following would occur on an electrocardiogram (ECG)compared to an individual at rest?

An older woman complains of shortness of breath and intermittent fainting spells.Her doctor runs various tests and finds that the atrioventricular (AV)node is not functioning properly.What is the suggested treatment?

Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle.

Match the following: -Atrioventricular (AV)valve with two flaps.