Question

A boy falls while riding his bike. a scrape on his hand almost immediately begins to bleed and becomes red, warm, and swollen. what response is occurring?

Answer 1

I believe the response which is occurring is the inflammatory response.
Given that his hand has been cut, his inflammatory system started working in order to fight off a possible infection. The hand starts bleeding, and becomes red, warm, and swollen, which are all indications that some harm has happened to the hand.