Answer:
The alveolar membrane- is where gas exchange between the blood and the atmosphere takes place. The gas molecules must diffuse across the alveolar epithelium and the capillary endothelium. ... Thus, the alveolar surface (as well as the respiratory bronchioles) have no cilia or mucus layer.
Explanation:
hope it helps =)
Answer:
lungs i think im almost positive
Calcium deficiency disease (hypocalcemia) --- like osteoporosis, osteopenia !!
<span>static friction I'm pretty sure</span>