Birds have two lungs connected to a trachea and ventilated by an aspiration pump (https://sumit012001.blogspot.com/2020/03/respiration-process-in-mammals.html ) . Lungs are paired , pink coloured , saccular , non elastic spongy organs of respiration . STRUCTURE ...
Although lungs and gills are the primary respiratory organ ¸ the skin can supplement breathing . Respiration through the skin , referred to as cutaneous respiration , can take place in air , in water, or in both. So many vertebrates are involved in cutaneous respiration . ( ...
Vertebrate lungs are designed for air breathing . Lungs are elastic bags that lie within the body. Their volume expands when air is inhaled and decreases when air is exhaled . Air ventilation : Aspiration pump ( Fig – ...
