converts energy in food to energy in ATP.

Formula for Cellular Respiration 6O 2 + C 6 H 12 O 6 → 6CO 2 + 6H 2 O + 36 ATP

Food and Calories The food and drink that you consume provide a source of energy for your cells. The energy is used to make ATP. calorie – the amount of energy needed to raise one gram of water one degree Celsius. Kilocalorie (on labels) – 1000 calories Food also provides the building blocks for your cellular products (proteins, hormones, etc.)

An overview of Cellular Respiration Cellular respiration can be aerobic (with oxygen), or anaerobic, (without oxygen) Aerobic respiration has 3 main steps: 1. Glycolysis 2. Krebs Cycle 3. Electron Transport Chain

Structure of Mitochondria A mitochondria’s structure is key to its role in cellular respiration. An envelope of two membranes encloses the mitochondria and there is a space between the outer and inner membranes.

Structure of a mitochondria continued… Inner Matrix-encloses a think fluid called the MATRIX The complex folding pattern of this membrane allows for many sites where reactions can occur.

A Road Map for Cellular Respiration A cell’s chemical processes make up a cell’s METABOLISM Pathways-Anabolic and Catabolic 3 main stages

Stage 1: Glycolysis Means splitting of sugar Breaks down a glucose molecule TAKES PLACE: outside the mitochondria in the cytoplasm of the cell ATP Molecules produced: 4 made-2 used (net gain of 2)

Stage 2: Krebs Cycle Finishes the breakdown of pyruvic acid molecules to carbon dioxide, releasing more energy in the process TAKES PLACE: In the matrix within the mitochondria ATP molecules produced: 2 ATP molecules

Stage 3: Electron Transport Chain and ATP Synthase Action TAKES PLACE: In the inner membrane of the mitochondria ATP molecules produced: 32 ATP molecules