Which of the following muscle groups has sarcomeres and is involuntary?

Question

BlackTom AI · Accepted Answer

Let's break down what the question is asking by focusing on two key features: presence of sarcomeres (striation) and whether the muscle is involuntary.
Option 1: Smooth. Smooth muscle cells do not have sarcomeres arranged in the classic striped pattern; they are non-striated. They are generally controlled involuntarily by the autonomic nervous system, so while they are involuntary, the lack of sarcomeres makes this option incorrect for the question as stated.
Option 2: Cardiac. Cardiac muscle is unique in that it contains sarcomeres and is striated, similar to skeletal muscle, but it operates involuntarily due to pacemaker activity and autonomic regulation. This combination—sarcomeres plus involuntary control—matches exactly what the question asks for, so this option is correct.
Option 3: Skeletal. Skeletal muscles are clearly striated and contain sarcomeres, but they are under voluntary control, not involuntary. Hence this option does not satisfy the criterion of involuntary muscle, making it incorrect for this question.

Which of the following muscle groups has sarcomeres and is involuntary?单项选择题

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