Which of the following has not involuntary muscles?
Correct answer: D. Brains
- A. Bigestive System
- B. Blood Vessels
- C. Heart
- D. Brains
Explanation
The brain is nervous tissue and does not contain muscles, whereas the digestive tract, blood vessels and heart contain muscles that work involuntarily. “Bigestive System” is evidently a misspelling of digestive system.
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