Respiration Definition

Respiration is a metabolic process that takes place in every living thing. It is a biological reaction and during respiration exchange of gases takes place in the organisms’ cells. The breakdown of glucose produces energy (ATP, or adenosine triphosphate), which is later utilized by cells to execute numerous operations. Respiration is carried out by all living things, from single-celled creatures to multicellular giants.

Difference Between Breathing and Respiration

Living creatures are distinct by their cellular respiration and ability to breathe. These words, nevertheless, are not exchangeable and have substantial variances. Also, physiologic and cellular respiration are two separate processes. In this article, we will discuss respiration and gaseous exchange.

Difference Between respiration and gas exchange

• Breathing is the biological action of inhaling and exhaling gases between the environment, and cells, as explained previously. Breathing is controlled by the nose, lungs, and windpipe, among other respiratory tissues
• On the other hand, respiration is a chemical reaction that takes place within the cell. The air we breathe transports oxygen to our lungs and subsequently to our cells, where it assists in the breakdown of glucose and the creation of energy. Cells employ this energy to do their tasks

Types of Respiration

There exist two kinds of respiration:

Aerobic respiration

It is a sort of energy-producing cellular respiration that occurs in the existence of oxygen. It is a continual process that occurs in animal and plant cells. The following chemical equation may be used to describe this procedure:

Glucose(C6H12O6) + Oxygen(6O2) → Carbon dioxide(6CO2)+ Water(6H2O)+  Energy (ATP)

Anaerobic respiration

It is a sort of cellular respiration in which energy is produced without the need for oxygen. Anaerobic respiration’s chemical equation is as follows:

Glucose(C6H12O6) → Alcohol 2(C2H5OH) + Carbon dioxide 2(CO2) + Energy (ATP )

Phases of Respiration in Organisms

In prokaryotic cells, breathing takes place in the cytoplasm and near the plasma membrane. Respiration occurs in the mitochondria of eukaryotic cells, which is also known as the cell’s powerhouse.

This process is quite similar to internal combustion in an automobile engine, in which organic molecules and oxygen are introduced and water and carbon dioxide are expelled. The released energy is used to power vehicles (or cells). Respiration is divided into three phases:

Glycolysis

The glucose molecules are transformed to pyruvic acid, which is then oxidized to carbon dioxide and water, leaving two carbon molecules, acetyl-CoA. ATP and NADH are both created during glycolysis. In the Kreb’s cycle, pyruvate enters mitochondria’s inner matrix and undergoes oxidation.

Oxidative Phosphorylation

The transport of electrons from NADH or FADH2 to O2 by a sequence of electron carriers results in the formation of ATP molecules. Within a cell’s mitochondria, this process occurs.

Citric Acid Cycle

The tricarboxylic acid cycle, or Kreb’s cycle, is another name for this process. Each step of the citric acid cycle produces two ATP molecules, and it occurs within a cell’s mitochondrial matrix. The electrons produced by Kreb’s cycle go through the mitochondrial matrix.