respiratory system is the network of organs and tissues that help you breathe

alveolar alveoli alveolus anatomical anatomy artery biology blood breath bronchi bronchus called capillaries capillary carbon cavity co2 cupshaped diagram dioxide disease education epithelial exchange extracellular found gas hemoglobin hollow illustration important inside latin layer little lung lungs medical medicine molecule organ oxygen parenchyma parts place plural pores pulmonary respiratory structure surrounded takes tissue where