The Latin verb supponere, meaning substitute, has several legitimate heirs in English, including supposititious (which dates from the early 17th century) and supposition (a 15th century addition).
Cellular respiration takes place in the organelles called mitochondria. The mitochondria take in glucose, a type of sugar, and change it in the presence of oxygen into an energy-rich molecule called ATP, or adenosine triphosphate. For every molecule of glucose, 36 molecules of ATP are made.
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. Apart from cellular respiration67, mitochondria also play a key role in the ageing process as well as in the onset of degenerative disease578.