Which muscle type forms the walls of the heart and contracts involuntarily?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which muscle type forms the walls of the heart and contracts involuntarily?

Explanation:
Cardiac muscle tissue makes up the walls of the heart and contracts automatically, without conscious control. This specialized muscle is capable of rhythmic, forceful contractions that pump blood, and its fibers are connected by intercalated discs that synchronize the heartbeat. Although it is striated like skeletal muscle, cardiac muscle is not voluntarily controlled; autonomic nerves and intrinsic pacemaker cells regulate heart rate and contraction strength. In contrast, skeletal muscles are voluntary and attach to bones, while smooth muscles are involuntary and non-striated, lining the walls of hollow organs.

Cardiac muscle tissue makes up the walls of the heart and contracts automatically, without conscious control. This specialized muscle is capable of rhythmic, forceful contractions that pump blood, and its fibers are connected by intercalated discs that synchronize the heartbeat. Although it is striated like skeletal muscle, cardiac muscle is not voluntarily controlled; autonomic nerves and intrinsic pacemaker cells regulate heart rate and contraction strength. In contrast, skeletal muscles are voluntary and attach to bones, while smooth muscles are involuntary and non-striated, lining the walls of hollow organs.

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