Explain what negative feedback is, and use the example of one homeostatic mechanism in the endocrine system to explain how this is applied (not using ADH). Components of the respiratory system

Explain what negative feedback is, and use the example of one homeostatic mechanism in the endocrine system to explain how this is applied (not using ADH).

Name three organs/components of the respiratory system (e.g. alveoli) and explain their structures, linking this to their functions. (its important to be specific regarding the structure and its function):