The opening of the bladder into the urethra is guarded by ______.

epiglottis

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sphincter muscles

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guard cells

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close cells

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Solution

The correct option is B sphincter muscles
The opening of the bladder into the urethra is guarded by sphincter muscles. When the bladder is full, it sends a message to the brain; which is us getting the signal that we have to go to the washroom. The sphincter muscles relaxes and the liquid flows through the urethra out of the body.

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