All of the following are the results of an overreactive immune system to harmless antigens except a. allergies. b. lupus. c. aids. d. asthma.

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger