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Parallel to the larynx and oropharynx is the esophagus (part of the digestive system) but should be included in your illustration as a low-contrast color. At the mandibular angle, a small “flap” should be noted; this is the epiglottis, which covers the trachea when swallowing to prevent debris from entering the lungs. Draw a flat kidney bean shape following the outline of the base of the lungs. The diaphragm is a muscle that contracts during inhalation and relaxes during exhalation to modify pressure in the lungs. Segment the right lung into 3 curved sections (draw the oblique and horizontal fissures) and the left lung into 2 curved sections (draw the oblique fissure) as distributed below; these segments are called lobes. Extend the branching of the bronchus in each lung into a secondary bronchus in each lobe. Then extend this secondary branching with smaller bronchioles.  It is helpful to do each lobe branch in a new color to distinguish the branching pattern. Attached to these bronchioles are alveoli, which appear as small grapes. Detail several of these and then extend a microscope box away from your diagram to illustrate this structure more clearly. Redraw a segment of the bronchioles and attached alveoli in the microscope box. The bulbous “grape” like structures of the alveoli are called alveolar sacs, and the segment of branching immediately before the alveoli are called alveolar ducts.  In addition to these structures, draw an overlay of the pulmonary artery (red) and pulmonary vein (blue) leading into the arteriole and venule capillary system.     {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e3\/Capillaries_respsyst_gb2653.png\/460px-Capillaries_respsyst_gb2653.png","bigUrl":"\/images\/thumb\/e\/e3\/Capillaries_respsyst_gb2653.png\/558px-Capillaries_respsyst_gb2653.png","smallWidth":460,"smallHeight":462,"bigWidth":"558","bigHeight":"560","licensing":"<div class=\"mw-parser-output\"><p>Image by: Uploader<br>\nLicense: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by\/3.0\/\">Creative Commons<\/a>\n<\/p><\/div>"} Draw lines away from each structure to an open space using a ruler or straight edge. Clearly label each structure or region correctly. For more complex drawings, it is sometimes beneficial to label structures numerically and then provide an organized key.

Summary:
Include landmark structures. Sketch the diaphragm. Detail the lobes of the lungs. Outline the branching. Draw a microscope bubble. Detail the alveoli. Label your completed diagram.