Which of the following has not involuntary muscles?
Correct answer: B. Brains
- A. Bigestive System
- B. Brains
- C. Heart
- D. Blood Vessels
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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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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