As a biomedical expert with a focus on human physiology, I can tell you that the organ responsible for producing energy in the body is the mitochondria. Mitochondria are often referred to as the "powerhouses of the cell" because they generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.

The process of energy production in mitochondria involves a series of chemical reactions known as cellular respiration. This process includes three main stages: glycolysis, the citric acid cycle (also known as the Krebs cycle or TCA cycle), and the electron transport chain coupled with oxidative phosphorylation.

Glycolysis occurs in the cytoplasm of the cell and is the first step in breaking down glucose, a simple sugar, to produce a small amount of ATP and also pyruvate, which is then used in the next stages.

The citric acid cycle takes place in the mitochondrial matrix, where pyruvate is converted into acetyl-CoA and enters the cycle, producing carbon dioxide, a small amount of ATP, and high-energy electron carriers.

Finally, the electron transport chain and oxidative phosphorylation occur across the inner mitochondrial membrane. Here, the high-energy electrons from the electron carriers are used to pump protons across the membrane, creating a proton gradient. This gradient drives the synthesis of ATP through a process called chemiosmosis.

It is also important to note that while mitochondria are the primary site for ATP production, other cellular processes contribute to energy metabolism. For example, glycogen breakdown in the liver and muscle cells can release glucose for glycolysis. Additionally, the liver plays a significant role in overall metabolic regulation, including the breakdown of fats and the production of bile, which aids in the digestion and absorption of dietary fats.

The liver, as mentioned, is a multifunctional organ that has a central role in metabolism. It is involved in the synthesis and breakdown of proteins, carbohydrates, and fats. It also detoxifies harmful substances and produces bile, which is essential for the emulsification and absorption of fats in the small intestine.

However, the liver is not the primary energy-producing organ; its role in energy production is more indirect, through its involvement in metabolic pathways that support the production of energy substrates.

In summary, while the liver plays a crucial role in metabolic processes, including the breakdown of fats, the actual production of energy in the form of ATP primarily takes place in the mitochondria through the process of cellular respiration.

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It is also one of the organs that break down old or damaged blood cells. The liver plays a central role in all metabolic processes in the body. In fat metabolism the liver cells break down fats and produce energy. They also produce about 800 to 1,000 ml of bile per day.Aug 22, 2016read more >>