enumerate those digestive glands which are found on inner lining of the alimentary canal. describe secretion of one of them
Answers
Answer:
Oxygen (O2) is utilized by the organisms to indirectly break down nutrient molecules like glucose and to derive energy for performing various activities. Carbon dioxide (CO2) which is harmful is also released during the above catabolic reactions. It is, therefore, evident that O2 has to be continuously provided to the cells and CO2 produced by the cells have to be released out. This process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration.
Metabolic Pathways
Metabolic pathways that lead to a more complex structure from a simpler structure are called biosynthetic pathways or anabolic pathways. Example: acetic acid becomes cholesterol.
Metabolic pathways that lead to a simpler structure from a complex structure are called catabolic pathways. Example: glucose becomes lactic acid in our skeletal muscle.
Anabolic pathways consume energy. Assembly of a protein from amino acids requires energy input.
On the other hand, catabolic pathways lead to the release of energy. For example, when glucose is degraded to lactic acid in our skeletal muscle, energy is liberated. This metabolic pathway from glucose to lactic acid which occurs in 10 metabolic steps is called glycolysis.
Living organisms have learnt to trap this energy liberated during degradation and store it in the form of chemical bonds.
As and when needed, this bond energy is utilized for biosynthetic, osmotic and mechanical work that we perform.
The most important form of energy currency in living systems is the bond energy in a chemical called adenosine triphosphate (ATP).
Explanation:
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