13. How does exercise affect the respiratory system? a. Breathe deeper when exercising, so that brings more oxygen into your lungs which decreases blood flow throughout the body. b. Breathe deeper when exercising, so that brings more oxygen into your lungs which increases blood flow throughout the body. c. Breathe deeper when exercising, so that brings less oxygen into your lungs which increases blood flow throughout the body. d. Breathe deeper when exercising, so that brings more carbon dioxide into your lungs which increases blood flow throughout the body.​