Lung is not only the respiratory organ of human body, but also an important hematopoietic organ of human body. It is located in the thoracic cavity, fixed with thoracic vertebrae and sternum, connected with ribs and protected. Anatomical map of normal human lung - physiological structure map the lung resides in the chest, one on the left and one on the right, connected to the trachea and throat, and connected to the nose. How to draw the simple strokes of the human lung? Draw two lines as the trachea, draw branches at the end as the tracheal vesicles, draw an ellipse on the outside as the shape of the lung, and then apply the appropriate color.