Читать книгу Understanding Anatomy and Physiology in Nursing - John Knight - Страница 89

The heart can conveniently be thought of as two separate pumps which circulate blood in series (Figure 3.4). The right-hand side of the heart pumps deoxygenated blood to the lungs via the pulmonary circuit and the left-hand side of the heart pumps oxygenated blood from the lungs to all other organ systems via the systemic circuit. The pulmonary arteries and pulmonary veins are unusual blood vessels; unlike most arteries (which usually carry oxygenated blood) the pulmonary arteries carry deoxygenated blood to the lungs, and unlike most veins (which usually carry deoxygenated blood) the pulmonary veins carry oxygenated blood from the lungs.

Nurses are expected to know the basic circulation of blood through the heart including the names of the major blood vessels, chambers of the heart and heart valves through which the blood will pass. Activity 3.1 will help you to learn the names and the correct sequence of blood flow.

Now that you understand the circulation of blood through the pulmonary and systemic circuits, we will explore the nature of the heartbeat.

Figure 3.4 Circulation of blood and major blood vessels of the pulmonary and systemic circuits