Plants carry out gaseous exchange for: photosynthesis and cellular respiration.
[Photo credit:
Yvan Lindekens]
Photosynthesis is the process by which green plants manufacture their food, making use of carbon dioxide and water in the presence of sunlight.
The most complex respiratory system is found in mammals. Most vertebrates, including birds, lizards and mammals use the lungs as their only respiratory organs where gaseous exchange takes place.
LUNGS
[Photo credit: Patrick J. Lynch, medical illustrator]
RESPIRATORY SYSTEM IN UNICELLULAR ORGANISMS
[Photo credit: Dr.Tsukii Yuuji]
Unicellular organisms have no special respiratory organs, as well as aquatic animals such as Amoeba and Paramecium. Oxygen that dissolves in water diffuses into the body while carbon dioxide goes out of the body through the
Respiration can be defined as biochemical activity of the cell, in which glucose is broken down by a series of reactions, controlled by enzymes, to release energy.
[Photo credit: Regis Frey]
