Q: What is the responsibility of smooth muscles in the human body?  

Answer: B

Smooth muscles are one of the three types of muscles found in the human body, the others being skeletal and cardiac muscles. Smooth muscles are not under our conscious control and are responsible for carrying out most of the involuntary processes in our body. These muscles are found in the walls of internal organs, such as the stomach, intestines, and blood vessels, and help to move substances through the body by contracting and relaxing. For example, smooth muscles in the digestive tract contract to move food along the digestive system, and the smooth muscles in the blood vessels help to regulate blood pressure by dilating or constricting the vessels. Therefore, option B is the correct answer.

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