1. Chronic stress gives rise to genuine physical pathological symptoms – relax!

2. if we just used passive diffusion, cells would certainly dry out! Instead we have a respiratory epithelium that is a flat sheet of cells devoted to gas exchange; it’s living, so it must be moist, and it minimizes the diffusion distance while maximizing surface area available

The movie Saw 3 is pack jammed with gore and horror and evil.

Many nights I just can’t sleep because of a horrific insomnia that keeps me up.

3. pathway = nose, mouth, pharynx, larynx, trachea, bronchi, lungs
it humidifies the air, warms the air for inhalation; cells are constantly secreting muscus that can trap particulates, and are ciliated- they are constant beating or waving to move the muscus upwards to the throat and mouth where it is swallowed…mucus elevator

4. see above; a production of pathogens or dust or debris produces a lot of mucus, and a stuffy nose develops

5. it controls the resistance to airflow and the distribution of air in the lungs; it is controlled by the ANS

6. there is increased mucus and generally inflammation that tightens airways, so there’s an increased chance of chronic infection in the lungs