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md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com

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(3) Relationship of wall thickness to required pressure levels. A<br />

cross-section of the chambers shows that the atrial walls are relatively thin. The right<br />

ventricular wall is much thicker. The left ventricular wall is three to five times thicker<br />

than that of the right. These differences in wall thickness reflect the amount of muscle<br />

tissue needed to produce the amount of pressure required of each chamber.<br />

(4) Cardiac valves (figure 9-3).<br />

Figure 9-3. Scheme of heart valves.<br />

MD0006 9-9

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