Which type of muscle tissue is involuntary (not under conscious control)?

• A. Cardiac muscle
• B. Skeletal muscle
• C. Voluntary (striated) muscle
• D. Smooth muscle

Answer: (A)

Verified step by step guidance

1. Understand the three main types of muscle tissue: skeletal, cardiac, and smooth muscle.
2. Recall that skeletal muscle is voluntary, meaning it is under conscious control and is striated in appearance.
3. Recognize that cardiac muscle is found only in the heart and is involuntary, meaning it functions without conscious control; it is also striated.
4. Know that smooth muscle is also involuntary and found in walls of internal organs like the intestines and blood vessels; it is non-striated.
5. Identify that the question asks specifically for the involuntary muscle type, and among the options, cardiac muscle fits this description as it is involuntary and unique to the heart.