What happens when the body detects that a parasite is feeding off the body? Responses The endocrine system will produce insulin to fight the parasite. The endocrine system will produce insulin to fight the parasite. The respiratory system will exhale the parasite. The respiratory system will exhale the parasite. The circulatory system will transport the parasite to the stomach. The circulatory system will transport the parasite to the stomach. The immune system's white blood cells will go to the site of infection.