What are the 3 main chemical factors that control respiration? a. b. C. 2. What part of the brain are the inspiratory neurons located? 3. Inspiratory neurons send impulses along the nerve to the (skeletal muscle) and muscles 4. If a patient hyperventilates, what happens to their CO2 levels? 5. Name 4 other factors that influence ventilation? a. b. C. d. What are the 5 factors that increase ventilation during exercise? a. b. c. d. e.