When you are tired your body stops taking in enough oxygen, you yawn to compensate. As such when you see others yawn it alerts your body to the need of more oxygen, so you do too.
Because you're tired.
it means either you are bored or they are tired
None ! Yawning is either the body signalling you're tired, or that you're short of oxygen. Nothing to do with muscles !
Yawning helps you get more oxigen to the brain.
yes............and it can also mean you are tired
For many years yawning has been associated with one being tired, bored or stressed. If one wishes to learn more about yawning, the site with the most detailed information would be on Wikipedia.
Um, I shouldn't think that yawning itself causes heart palpitations, but if you are extremely tired, there is more chance of you having a palpitation.
They will feel dizzy. Weak. Tired and they will keep yawning.
You can't stop yawning because when you yawn your body is trying to get more oxygen into you body to try and stay awake. If you are yawning constantly your body is trying to keep you awake, the longer you stay awake, the more you will yawn.
Well, it isn't good or bad. It is just something you're body does naturally when it's tired. You yawn because when you are tired, you don't have as much oxygen as you normally do.
Technically, no it doesn't. it's one of the bodies natural reactions to a buildup of CO2 in the body