Figure 1 Organs of respiratory system in human beings Image source: OpenStax College , CC BY 3.0 , via Wikimedia Commons; Figure 2 Respiratory passage Figure 3 Pulmonary ventilation Figure 4 External respiration FIgure 5 Oxygen dissociation curve Image source: Peter Southwood , CC0, via Wikimedia Commons;
Figure 1 Glands and organs of digestive system in human beings Image source: OpenStax College , CC BY 3.0 , via Wikimedia Commons Figure 2 Liver and Pancreas (digestive glands) Image source: BruceBlaus. When using this image in external sources it can be cited as:Blausen.com staff (2014). "Medical gallery of Blausen Medical 2014". WikiJournal of Medicine 1 (2). DOI:10.15347/wjm/2014.010. ISSN 2002-4436. , CC BY 3.0 , via Wikimedia Commons