Question

Urination

O all of the answers are correct
O requires the relaxation of two sphincters.
O requires contraction of the muscularis layer in the urinary bladder.
O none of the answers are correct
involves both "voluntary" skeletal muscles and "involuntary" smooth muscles.

Answer 1

Urination involves both voluntary and involuntary muscles to facilitate the passage of urine.

Step-by-step explanation:

Urination involves both voluntary skeletal muscles and involuntary smooth muscles. When the urinary bladder is full and it is time to urinate, the brain sends a signal to the skeletal muscles of the external urethral sphincter, which can be voluntarily relaxed to allow the passage of urine. At the same time, the muscularis layer in the urinary bladder contracts to push urine out through the urethra. These coordinated actions of voluntary and involuntary muscles facilitate the process of urination.

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