Q: From where does the signal for voluntary muscle for forced breathing originate?  

Answer: B

The signal for voluntary muscle for forced breathing starts in the cerebrum. The cerebrum is the part of the brain responsible for conscious actions and voluntary movements. During forceful inspiration or expiration, the signals are generated through the cerebrum and sent to the respiratory muscles to increase the strength of breathing. This type of breathing is also known as "forced breathing" and is used in situations where more air needs to be taken in or expelled from the lungs, such as during exercise or in certain medical conditions.

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