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3.7.1 Define cell respiration Syllabus definition: Cell respiration is the controlled release of energy from organic compounds in cells to form ATP.

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Presentation on theme: "3.7.1 Define cell respiration Syllabus definition: Cell respiration is the controlled release of energy from organic compounds in cells to form ATP."— Presentation transcript:

1 3.7.1 Define cell respiration Syllabus definition: Cell respiration is the controlled release of energy from organic compounds in cells to form ATP.

2 ATP ATP or Adenosine triphosphate is the molecule which directly fuels the majority of biological reactions. Everyday each person will hydrolyse (reduce) ATP molecules to ADP. The ADP is reduced back to ATP using the free energy from the oxidation of organic molecules.

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4 What is respiration? Respiration is the process by which organisms extract the energy stored in complex molecules and use it to generate adenosine triphosphate (ATP). ATP provides the immediate source of energy for biological processes such as active transport, movement and metabolism. In this way they obtain energy to fuel their metabolic pathways. ATP

5 Types of respiration During aerobic respiration, a respiratory substrate, e.g. glucose, is split in the presence of oxygen to release carbon dioxide and water. A large number of ATP molecules are produced, releasing the energy from the glucose. C 6 H 12 O O 2  6 CO H 2 O + 36 ATP In anaerobic respiration, glucose is converted (in the absence of oxygen) to either lactate or ethanol. The ATP yield is low. C 6 H 12 O 6  2 C 3 H 6 O ATP lactate C 6 H 12 O 6  2 C 2 H 5 OH + 2 CO ATP ethanol

6 Glycolysis Glycolysis is the stage of respiration which takes place in the cytoplasm. It is the first stage of respiration. This stage is required in order for the second and third stages to occur.

7 Where does respiration occur? Mitochondria contain highly folded inner membranes that hold key respiratory proteins (including the enzyme that makes ATP) over a large surface area. Respiration occurs in all living cells. In eukaryotes the early stages of respiration occur in the cytoplasm. The later stages of respiration are restricted to the mitochondria. Mitochondria have their own DNA and ribosomes, so can manufacture their own respiratory enzymes. Mitochondria provide an isolated environment to maintain optimum conditions for respiration.

8 GLYCOLYSIS If O2 is present then pyruvate enters the mitochondria and more ATP is produced. hill.com/sites/ /student_view0/chapter25/animation__how _glycolysis_works.html

9 Multi-stage process here involving transfer of hydrogen and transfer of inorganic phosphate groups. No O2 then pyruvate is converted into lactic acid.

10 No O2 then ethanol and carbon dioxide are produced

11 Homework 1.Where in the cell does glycolysis? 2.Explain the process of glycolysis. 3.Where does aerobic respiration take place in eukaryotic cells? 4.What are the products of anaerobic respiration?


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