system
Given the following post, respond as if you're commenting on Reddit:
human
Do astronauts have difficulties with swallowing and digestion?

Would weightlessness mean that food and water floats around inside your body, making digestion hard? If so, how is it dealt with?
gpt
The oesophagus has sphincters to help push the food you swallow into your stomach, by contracting the oesophagus at the "end" side of the chunk of food and dilating it in the front while the food progresses in the direction of the stomach. Gravity helps getting the food down but isn't necessary for the swallowing part, as you already have a biological mechanism for it.

I can't say for digestion though.