The blood vessels dilate to increase the "blood traffic" through the lungs to carry more oxygen to the muscle. The lungs work harder (faster respiratory rate) to increase the rate of oxygen/carbon dioxide exchange in the lungs.
Hope that helps you!
Obesity
because i had researched it about a week ago.
Everything. Everything in your life and some others is yours. Each choice leads to more. Every single thing you do, think about. or just do requires you to make a choice. This is why you can't blame others....you did it...