Diagram of Cellular Respiration

A diagram of cellular respiration shows the process by which cells convert glucose and oxygen into energy (ATP), releasing carbon dioxide and water as byproducts. Cellular respiration is a vital metabolic process occurring in all living organisms. The process consists of several interconnected stages, including glycolysis, the citric acid cycle, and oxidative phosphorylation.

The well-labelled diagram of cellular respiration process is given below:

👁 Diagram-of-cellular-respiration

What is Cellular Respiration?

Cells use a process called cellular respiration to break down organic molecules like glucose and create adenosine triphosphate (ATP), which is the energy source. The diagram of cellular respiration in mitochondria in eukaryotic cells shows the sequence of metabolic events that release the energy which has been stored in the bonds between other molecules and glucose.

Glycolysis, the citric acid cycle (often referred to as the Krebs cycle), and oxidative phosphorylation (which includes the electron transport chain) are the three basic phases of cellular respiration. All things considered, cellular respiration is crucial for giving cells the energy they require to perform a variety of tasks and sustain biological processes.

Also Read: Difference Between Respiration and Combustion

Steps of Cellular Respiration

Cellular respiration take place inside the cells of living things, especially in the mitochondria of eukaryotic cells. There are many phases to the process:

Glycolysis

The process known as glycolysis occurs in the cytoplasm of cells and is the initial phase of cellular respiration. Two molecules of pyruvate are produced at this point from one glucose molecule. Some ATP and NADH are also produced during this process.

Pyruvate Oxidation

Glycolysis produces pyruvate, which is then transferred into the mitochondria of eukaryotic cells. It is then transformed into acetyl-CoA, which moves on to the next phase of cellular respiration, there after going through a sequence of events known as pyruvate oxidation.

Citric Acid Cycle (Krebs Cycle)

The citric acid cycle takes place in the mitochondrial matrix. Oxaloacetate and acetyl-CoA combine to produce citrate, which then proceeds through a sequence of enzymatic processes to regenerate oxaloacetate. Along the process, high-energy electrons are transported to carrier molecules like FADH2 and NADH, while carbon dioxide is liberated. In the following phase, ATP will be produced using these carrier molecules.

This step of oxidative phosphorylation takes place in the inner membrane of the mitochondria. It allows the movement of electrons to the electron transport chain (ETC) from NADH and FADH2. An electrochemical gradient is produced when protons (H+ ions) are pumped across the inner mitochondrial membrane. Protons returning to the mitochondrial matrix through ATP synthase drives the synthesis of ATP, a process known as chemiosmosis.

Types of Cellular Respiration

Types of cellular respiration is given below:

Aerobic Respiration

• Cells produce energy through aerobic respiration in the presence of oxygen.
• Aerobic respiration consists of glycolysis, oxidative phosphorylation (electron transport chain) and the citric acid cycle (Krebs cycle).
• Glycolysis breaks down glucose into pyruvate, yielding ATP and NADH.
• Pyruvate enters the citric acid cycle, producing more FADH2, NADH, ATP, and carbon dioxide.
• Electrons from NADH and FADH2 create a proton gradient in the electron transport chain.
• Protons return to the mitochondrial matrix through ATP synthase, generating ATP.
• Aerobic respiration produces 36-38 ATP from each glucose molecule.

Also Read: Aerobic Respiration

Anaerobic Respiration

• Anaerobic respiration is less efficient in ATP production compared to aerobic respiration due to the absence of oxygen.
• It involves fermentation, yielding ATP and byproducts such as ethanol and lactic acid.
• Fermentation partially oxidizes glucose, releasing ATP and organic compounds.
• Glycolysis can proceed without oxygen through the regeneration of NAD+ from NADH.
• Anaerobic respiration also uses substitute electron acceptors like nitrate or sulfate.
• Despite potentially producing more ATP than fermentation, anaerobic respiration is generally less effective than aerobic respiration.

Also Read: Difference Between Aerobic and Anaerobic Respiration

Why is Cellular Respiration Important?

The diagram of cellular respiration shows the process in detail. The importance of this process is as mentioned below:

• Cellular respiration is crucial for providing energy to cells.
• It enables organisms to convert glucose into ATP, the universal energy currency.
• ATP powers various cellular processes, including muscle contraction, protein synthesis, and nerve impulse transmission.
• Without cellular respiration, organisms would not have the energy needed for survival and growth.

Conclusion: Diagram of Cellular Respiration

In conclusion, diagram of cellular respiration shows the breakdown of glucose molecules in the presence of oxygen to produce ATP, carbon dioxide, and water. This process occurs in multiple stages, including glycolysis, the citric acid cycle, and oxidative phosphorylation, which collectively yield energy for cellular functions. Cellular respiration is represented as a cyclic process, as depicted in the diagram, showcasing its continuous nature in sustaining life.

Also Read:

• Difference Between ATP and ADP
• Types and Phases of Respiration
• Respiration In Plants