What characteristic distinguishes cardiac muscle tissue from smooth muscle tissue?

What characteristic distinguishes cardiac muscle tissue from smooth muscle tissue?

• A. Cardiac tissue is voluntary
• B. Cardiac tissue is fatigue resistant
• C. Cardiac tissue is found in the digestive system
• D. Cardiac tissue supports joint movement

Answer: (B)

Cardiac muscle tissue is indeed characterized by its fatigue resistance, which is essential for its function. The heart is constantly contracting and relaxing to pump blood throughout the body, so it must be able to sustain this activity without tiring easily. This fatigue-resistant quality comes from the muscle fibers having a rich supply of blood, abundant mitochondria, and a unique structural arrangement that allows for continuous and rhythmic contractions necessary for effective heart function. In contrast, smooth muscle tissue, which is found in the walls of internal organs such as the digestive system, is more prone to fatigue during prolonged contractions but is also more adaptable to various recovery demands. Additionally, it's important to recognize that cardiac tissue is involuntary; it doesn't require conscious control, unlike skeletal muscle, which is responsible for voluntary movements. Cardiac tissue is not associated with joint movement (that role is primarily performed by skeletal muscle), and it is not located in the digestive system, which is the domain of smooth muscle. Therefore, the unique characteristic of cardiac tissue being fatigue resistant is essential for its role in maintaining consistent heart function over a lifetime.

Cardiac muscle tissue is indeed characterized by its fatigue resistance, which is essential for its function. The heart is constantly contracting and relaxing to pump blood throughout the body, so it must be able to sustain this activity without tiring easily. This fatigue-resistant quality comes from the muscle fibers having a rich supply of blood, abundant mitochondria, and a unique structural arrangement that allows for continuous and rhythmic contractions necessary for effective heart function.

In contrast, smooth muscle tissue, which is found in the walls of internal organs such as the digestive system, is more prone to fatigue during prolonged contractions but is also more adaptable to various recovery demands. Additionally, it's important to recognize that cardiac tissue is involuntary; it doesn't require conscious control, unlike skeletal muscle, which is responsible for voluntary movements.

Cardiac tissue is not associated with joint movement (that role is primarily performed by skeletal muscle), and it is not located in the digestive system, which is the domain of smooth muscle. Therefore, the unique characteristic of cardiac tissue being fatigue resistant is essential for its role in maintaining consistent heart function over a lifetime.