When your bladder is really full, [ Select ] [\"inhibition\", \"a complete block

Question

When your bladder is really full,                             [ Select ]                       ["inhibition", "a complete block", "activation", "excitation"]         of                            [ Select ]                       ["parasympathetic", "somatic", "sympathetic", "visceral"]         neurons leads to relaxation of the                             [ Select ]                       ["external", "second", "internal"]         urethral sphincter. How do you keep from urinating involuntarily? It's because you still control the                            [ Select ]                       ["somatic", "parasympathetic", "sympathetic", "sexual"]         neurons that stimulate the muscles of your                             [ Select ]                       ["third", "external", "internal"]         urethral sphincter.

Explanation / Answer

When your bladder is really full, "activation" of "parasympathetic" neurons leads to relaxation of the "internal" urethral sphincter. How do you keep from urinating involuntarily? It's because you still control the "sympathetic", neurons that stimulate the muscles of your "external" urethral sphincter.

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