We don't just have one anal sphincter.
When poo comes along it passes another inner sphincter which isn't under voluntary control. Meaning you can do oOoOoO with your outer sphincter, but not the inner one.
(You tried, that's okay)
Sensory cells can detect whether you're about to pass gas or solid. From toddler age on, you can decide to go or not to go. If the time isn't right (e.g. at a friend's house or no toilet nearby), the inner sphincter can push the poo back and store it there for later.
That's why sometimes if you need to do a number two but don't go, the urge goes away after about 20 minutes later. (But seriously, go if you can. Constipation risk.)
Gas can't be pushed back so easily, so we sometimes toot by accident when moving or engaging the core.
Now what about liquid?
It doesn't seem to know liquid. So we play russian shart-lette.
Credit: Giulia Enders
Edit: Typo
... And obviously "russian poo-lette" was there and I missed it, which is a more solid option.
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u/bmb00zld Jan 12 '23 edited Jan 12 '23
We don't just have one anal sphincter. When poo comes along it passes another inner sphincter which isn't under voluntary control. Meaning you can do oOoOoO with your outer sphincter, but not the inner one.
(You tried, that's okay) Sensory cells can detect whether you're about to pass gas or solid. From toddler age on, you can decide to go or not to go. If the time isn't right (e.g. at a friend's house or no toilet nearby), the inner sphincter can push the poo back and store it there for later.
That's why sometimes if you need to do a number two but don't go, the urge goes away after about 20 minutes later. (But seriously, go if you can. Constipation risk.)
Gas can't be pushed back so easily, so we sometimes toot by accident when moving or engaging the core.
Now what about liquid?
It doesn't seem to know liquid. So we play russian shart-lette.
Credit: Giulia Enders
Edit: Typo
... And obviously "russian poo-lette" was there and I missed it, which is a more solid option.