Paths of Circulation

The blood vessels can be divided into two major pathways. The pulmonary circuit consists of vessels that carry blood from the heart to the lungs and back to the heart. The systemic circuit carries blood from the heart to all parts of the body, except the lungs, and back again (fig. 15.41). The systemic circuit includes the coronary

Shier-Butler-Lewis: I IV. Transport I 15. Cardiovascular System I I © The McGraw-Hill

Human Anatomy and Companies, 2001

Physiology, Ninth Edition

Systemic circuit

Pulmonary circuit

Systemic circuit

Kidneys

"L

Kidneys

\Trunl ower and i limbs

Figure 15.41

The pulmonary circuit consists of the vessels that carry blood between the heart and the lungs; all other vessels are included in the systemic circuit.

circulation, which supplies the heart itself and has already been described.

The circulatory pathways described in the following sections are those of an adult. Chapter 23 (pp. 960-961) describes the somewhat different fetal pathways.

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