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The lungs are the primary organs of the respiratory system in humans and most other animals including a few fish, and some snails. In mammals and most other vertebrates, two lungs are located near the backbone on either side of the heart. Their function in the respiratory system is to extract oxygen from the air and transfer it into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere, in a process of gas exchange. Respiration is driven by different muscular systems in different species. Mammals, reptiles and birds use their different muscles to support and foster breathing. In earlier tetrapods, air was driven into the lungs by the pharyngeal muscles via buccal pumping, a mechanism still seen in amphibians. In humans, the main muscle of respiration that drives breathing is the diaphragm. The lungs also provide airflow that makes vocal sounds including human speech possible. Humans have two lungs, a right lung, and a left lung. They are situated within the thoracic cavity of the chest.

This GIF Bitmap Image Lunch Free Photo is a part of Lunch Category in Food Folder. Lunch Free Photo has a Resolution of 300x227 Pixels. Lunch Free Photo is of .gif (Graphics Interchange Format) Format. It's Size is 27.6KB. This GIF has been Downloaded 75 times till now. Lunch Free Photo was Added on 04-07-2021. Download Lunch Free Photo by clicking the button below: