About this much of the energy released from food molecules during catabolism is released as heat: adenosine triphosphate (ATP)
The Adenosine triphosphate (ATP) is the source of the energy for the use and the storage at the cellular level. The structure of the ATP is a nucleoside triphosphate, consisting of the nitrogenous base (adenine), and ribose sugar, and the three serially bonded phosphate groups
ATP is synthesized in the mitochondria is the primary energy source for the important biological functions, such as the muscle contraction, the nerve impulse transmission, and the protein synthesis
In general, the main energy source for the cellular metabolism is the glucose, which is the catabolized in the three subsequent processes—the glycolysis, tricarboxylic and acid cycle (TCA or Krebs
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The right answer is vein (it contains blood and has valves).
The infra-cardiac veins of small and medium caliber possess this system of fight against gravity. The valves consist of a dense connective tissue, surmounted by endothelial cells, corresponding to a fold of the intima. They allow blood circulation in the sense organ / heart but prevent venous reflux.
