A brief overview of asthma and its treatment
The critical organ in the respiratory system is the two lungs the left being slightly smaller as it has to accommodate the heart. The tubes that carry air to the lungs divide successively and end up in very filamentous walled sacks called alveoli. The walls are highly vascular and the veins carrying the deoxygenated blood gradually a change to arteries as the blood gets oxygenated. These tubules called bronchi have very delicate membrane lining them.