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Biology Encyclopedia Entry 1777570085

** This entry is about the **Mitochondria**, the powerhouses of eukaryotic cells responsible for generating most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. ## Overview The **Mitochondria** is a vital organelle found in the cells of most eukaryotes, including animals, plants, and fungi. These organelles are often referred to as the "powerhouses" of the cell due to their primary function: generating energy for the cell through a process called cellular respiration. The mitochondria are unique in that they have their own DNA, known as **mitochondrial DNA (mtDNA)**, which is separate from the cell's nuclear DNA. The mitochondria are typically found in the cytoplasm of the cell, often in a region known as the **mitochondrial matrix**. This matrix is the site where the mitochondria's energy production takes place, involving the breakdown of glucose and other organic molecules to produce ATP. The mitochondria are also responsible for regulating the cell's energy metabolism, ensuring that the cell has a constant supply of energy. ## History/Background The discovery of the mitochondria dates back to the late 19th century, when German biologist **Carl Benda** first observed these organelles in 1898. However, it wasn't until the 1950s that the mitochondria's role in energy production was fully understood. The discovery of **oxaloacetate** and **citrate**, key molecules involved in the citric acid cycle, marked a significant milestone in the understanding of mitochondrial function. ## Key Information The mitochondria are composed of two main parts: the **outer membrane** and the **inner membrane**. The outer membrane is permeable, allowing certain molecules to pass through, while the inner membrane is impermeable and contains the **electron transport chain**, which generates the majority of the cell's ATP. The mitochondria also contain **mitochondrial cristae**, which are folded structures that increase the surface area of the inner membrane, allowing for more efficient energy production. The mitochondria have a unique structure and function, with their own system of **mitochondrial transport** that allows them to regulate the movement of molecules in and out of the organelle. The mitochondria are also capable of **mitochondrial division**, a process that allows them to reproduce and maintain their numbers within the cell. ## Significance The mitochondria play a critical role in maintaining the cell's energy balance, ensuring that the cell has a constant supply of ATP. Without functioning mitochondria, the cell would be unable to produce energy, leading to cell death. The mitochondria are also involved in various cellular processes, including **cell signaling**, **cell growth**, and **cell differentiation**. The study of the mitochondria has far-reaching implications for our understanding of human disease. Mitochondrial dysfunction has been linked to a range of diseases, including **neurodegenerative disorders**, **metabolic disorders**, and **cancer**. Understanding the mitochondria's role in these diseases could lead to the development of new treatments and therapies. INFOBOX: - Name: **Mitochondria** - Type: **Organelle** - Date: **1898** (first observed by Carl Benda) - Location: **Cytoplasm of eukaryotic cells** - Known For: **Generating energy for the cell through cellular respiration** TAGS: **Mitochondria**, **Energy production**, **Cellular respiration**, **Eukaryotic cells**, **Organelle**, **Mitochondrial DNA**, **Cell signaling**, **Cell growth**, **Cell differentiation**, **Mitochondrial dysfunction**