Cellular respiration- process that releases energy by breaking down glucose and other food molecules in the presence of oxygen (aerobic)
Cell respiration occurs in all types of cells, both plant and animal, eukaryotic and prokaryotic
What are the 3 processes (chemical pathways) of cell respiration?- Glycolysis in the cytoplasm, the Kreb's Cycle in the Mitochondrial Matrix and the Electron Transport Chain in the Mitochondrial Membrane.

During Glycolysis, a 6 carbon glucose molecule is broken in half to form two 3 carbon molecules called pyruvate. Glycolysis occurs in the cytoplasm of the cell. ∙ During the Krebs Cycle, pyruvic acid (pyruvate) is broken down into carbon dioxide in a series of energy extracting reactions. The Krebs cycle occurs in the mitochondria. ∙ The Electron Transport Chain uses high energy electrons from the Krebs Cycle to convert ADP into ATP. Electron transport chain occurs under aerobic condition and inside the mitochondria.

Anaerobic respiration: When oxygen is not present, glycolysis is followed by fermentation. Anaerobic conditions can occur during vigorous exercise when muscles are depleted of oxygen. Fermentation releases energy from food molecules by producing ATP in the absence of oxygen. Cells convert NADH to NAD+ by passing high-energy electrons back to pyruvic acid. This allows glycolysis to continue producing a steady supply of ATP. The 2 main types of fermentation are alcoholic fermentation and lactic acid fermentation.

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10th grade Biology Diapositivas sobre Biology Exam 2/7/18, creado por Nyashia Knights el 06/02/2018.