CVS Practice Test 2025 - Free CVS Practice Questions and Study Guide

The statement is false because excitatory and conductive muscle fibers in cardiac tissue, which include specialized cells like pacemaker cells and conducting fibers (e.g., Purkinje fibers), primarily serve roles in initiating and conducting electrical impulses rather than generating strong muscle contractions. These fibers do not contain the same number of contractile proteins as the contractile fibers found in the myocardial walls, which are responsible for the actual contraction of the heart muscle.

In contrast, the contractile fibers in the cardiac muscle are responsible for generating powerful contractions necessary for pumping blood. These fibers are densely packed with actin and myosin, which facilitate muscle contractions through the sliding filament mechanism. The excitatory and conductive fibers lack the structural components necessary for significant contraction force, emphasizing their functional specialization in the cardiac conduction system.

Therefore, the original assertion wrongly attributes strong contraction capabilities to these fibers, highlighting the importance of differentiating between the types of muscle fibers and their specific functions within the cardiac tissue.