Tags: Anatomical Structure.
The human lungs are the organs of respiration. Humans have two lungs a right lung and a left lung. The right lung consists of three lobes while the left lung is slightly smaller consisting of only two lobes (the left lung has a cardiac notch allowing space for the heart within the chest). Together the lungs contain approximately 2400 kilometres (1500 mi) of airways and 300 to 500 million alveoli.
