Drink out of a water bottle. Trying to use a glass may result in spilling some water, which will enter your nose!
wow i never knew that.
Peristalsis and esophgeal musclulature.
Peristalsis or muscles in your esophagus contract in a wave pushing the water to your stomach
Yes
The same way that a person can be upside-down on Earth and still swallow water. The ability to swallow has nothing to do with gravity; it has to do with the muscles in the esophagus which move food and water from the throat to the stomach.
You turn Upside down.
While most animals have a difficult time swallowing their food when they are held upside down, there is one animal that cannot swallow when held in this manner. This animal is a chicken.
Humans don't need gravity to swallow, although, interestingly, birds (i.e. canaries) do.
in water
because the spoon is concave, making the reflection upside down
freez the water. after freezing it will be ice then you can turn a glass of water upside down without spilling the water.
Yes. It's slightly more difficult because you're working against gravity, though. The oesophagus is a tube-like organ, and the act of swallowing squeezes the food through the tube to down to the stomach, or sideways, or up as the case may be.
Swallowing is a manipulation of the throat muscles, it's not down to gravity. In theory you can swallow while upside down (but it feels odd and is harder as you're working against gravity). Hope this answers your question.