CK-12 Foundation
Ck 12: Life Science: Autoimmune Diseases
[Free Registration/Login may be required to access all resource tools.] The immune system usually protects you from pathogens and other causes of disease. When the immune system is working properly, it keeps you from getting sick. But...
CK-12 Foundation
Ck 12: Life Science: Preventing Noninfectious Diseases
[Free Registration/Login may be required to access all resource tools.] Most allergies can be prevented by avoiding the substances that cause them. For example, you can avoid pollens by staying indoors as much as possible. You can learn...