explain the process of respiration in man(breathing and cellular respiration)
explain the process of respiration in man(breathing and cellular respiration)
Respiration in human includes both breathing and cellular respiration.
1. Breathing:
In human the process of breathing includes both inhalation and exhalation.
The process by which oxygen rich air is taken up through the nostril into the body is known as inhalation. During inhalation, the chest cavity increases in size due to the downward movement of the diaphragm (dome shaped muscular sheet that separates chest from abdomen). As a result air from outside rushes into the lungs to fill the extra space.
Exhalation is the process by which carbon dioxide rich air comes out of the body. It occurs when the diaphragm moves up and the chest cavity becomes narrower. This creates a pressure on the air inside the lungs. As a result the air comes out of the lings to the atmosphere due to lack of space inside. Both the process of inhalation and exhalation is commonly known as breathing.
2. Cellular respiration:
After the entry of oxygenated air into the lungs it passes to the cells through bloodstream. Cellular respiration takes place inside each and every cell. This process releases energy which is further used for other body metabolism. Carbon dioxide is also released in this process as a byproduct. There are two main steps of cellular respiration.
Glycolysis is a metabolic pathway which breaks down glucose into pyruvate. It is an anaerobic process and occurs in the cytoplasm of almost all cells. It is the first phase of cellular respiration.
Krebs cycle is the second phase of cellular respiration. The pyruvic acid which is produced in glycolysis is oxidized into carbon dioxide in krebs cycle. This phase of respiration requires oxygen.
Respiration in human includes both breathing and cellular respiration.
1. Breathing:
In human the process of breathing includes both inhalation and exhalation.
The process by which oxygen rich air is taken up through the nostril into the body is known as inhalation. During inhalation, the chest cavity increases in size due to the downward movement of the diaphragm (dome shaped muscular sheet that separates chest from abdomen). As a result air from outside rushes into the lungs to fill the extra space.
Exhalation is the process by which carbon dioxide rich air comes out of the body. It occurs when the diaphragm moves up and the chest cavity becomes narrower. This creates a pressure on the air inside the lungs. As a result the air comes out of the lings to the atmosphere due to lack of space inside. Both the process of inhalation and exhalation is commonly known as breathing.
2. Cellular respiration:
After the entry of oxygenated air into the lungs it passes to the cells through bloodstream. Cellular respiration takes place inside each and every cell. This process releases energy which is further used for other body metabolism. Carbon dioxide is also released in this process as a byproduct. There are two main steps of cellular respiration.
Glycolysis is a metabolic pathway which breaks down glucose into pyruvate. It is an anaerobic process and occurs in the cytoplasm of almost all cells. It is the first phase of cellular respiration.
Krebs cycle is the second phase of cellular respiration. The pyruvic acid which is produced in glycolysis is oxidized into carbon dioxide in krebs cycle. This phase of respiration requires oxygen.
