1. How does the human body respond to exercise?

the heart pumps more blood and sends it to the muscles. to create more blood more oxygen is used and you start to breathe harder. if you work out hard then you might get some lactic acid build-up.

hope this helped!

what subject is this

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.