Identify a muscle responsible for exit of waste material from the body. 

Correct option is B

• Sphincters are specialized muscles that surround and close an opening in the body, maintaining control over the passage of substances like urine, feces, or bile.

• The most well-known sphincters in the body are the anal sphincter, which controls the expulsion of waste, and the urinary sphincter, which controls the release of urine from the bladder.

• The sphincter muscle works as a voluntary or involuntary control mechanism, depending on the sphincter’s location in the body.

• Pectoralis: The pectoralis muscles are located in the chest and are primarily involved in the movement of the arms.

• Rectus: The rectus muscles (like the rectus abdominis) are involved in abdominal movement.

• Gastrocnemius: The gastrocnemius is a calf muscle involved in movement.