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Cellular Respiration Essay

650 words - 3 pages

CELLULAR RESPIRATION
• or energy metabolism refers to the chemical breakdown of nutrients by the cell to produce energy needed by the body
• the energy released from the breakdown of nutrients is not directly used by the body but used to synthesize ATP
• an opposite process of photosynthesis
• breaking down of carbohydrates in order to produce ATP molecules, represented as:
C6H12O6 + 6O2 6CO2 + 6H2O + ATP
• divided into four individual sub-pathways:
- anaerobic stage, Glycolysis
- a transition reaction connecting glycolysis with the krebs cycle
- an electron transport chain
Structure of Mithochondrion
• double membranes organelle found in almost all living cells
• the inner ...view middle of the document...

6 Glycolysis

Pyruvate
NAD+
NADH
Co-enzyme A
CO2

Acetyl-CoA

Figure 5.7 Transition reaction: Acetyl CoA formation

Figure 5.8 Krebs cycle

Figure 5.8 Krebs cycle
Glucose
2 ATP
MITOCHONDRION
CYTOPLASM
32 ATP
2 ATP
ETC
Krebs cycle
GLYCOLYSIS
Acetyl coA
Pyruvate

Figure 5.9 Summary of cellular respiration

Electron Transport Chain (ETC)
* series of carriers that accept electrons from NADH and FADH2
* occurs in the cristae of the mitochondrion
* energy is released as electrons pass from one carrier to the next
* this energy is used to produce ATP
* for every NADH molecule, 3 ATP is produced
* for every FADH2 molecule, 2 ATP is produced
* NADH formed in the cytoplasm results only in 2 ATP
* in mitochondria, the final electron acceptor is oxygen
* when oxygen accepts electrons it becomes negatively charged and...

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