Match the vocabulary word with the correct definition. 1. the ability to keep feelings and thoughts stable during the activities experienced in life internal system 2. the parts of the body that are related to the movement of blood periodontitis 3. a lung infection that can make it difficult to breathe and even cause death pneumonia 4. the organs inside the body and how they function together emotional health 5. the ability to think clearly and perform the mental tasks necessary in life mental health 6. a condition that can occur when the gums age and become more susceptible to infection circulatory system