Sam was burning a pile of wood in his garage and started feeling suffocated. This was due to the release of ___.
On a winter night Nishant burnt some wood in his closed room and slept. He started feeling very suffocated in the mid night and ran to open the doors. After moving outside he was relieved. What is the reason behind this?
While playing cricket, Sanjay was hit by the ball on his ankle. He was feeling a lot of pain and was not able to move his leg. After 10-15 mins, he found a swelling and redness on that portion of the ankle, where the ball had hit him.
In this case, the pain, redness and swelling are the