Question

what is respiration?give its mechanism​

Answer 1

Answer:

In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction. ... In contrast, exhalation (breathing out) is usually a passive process.

Mechanism of respiration involves the breathing mechanism and exchange of gases. The gaseous exchange occurs by diffusion in the alveoli. It depends upon the pressure differences between blood and tissues, or atmospheric air and blood. ... The mechanism of breathing has already been explained above.

Answer 2

Answer:

Respiration is the process in which organisms exchange gases between their body cells and the environment. From prokaryotic bacteria and archaea’s to eukaryotic protists, fungi, plants, and animals, all living organisms undergo respiration. Respiration may refer to any of the three elements of the process.

First, respiration may refer to external respiration or the process of breathing (inhalation and exhalation), also called ventilation. Secondly, respiration may refer to internal respiration, which is the diffusion of gases between body fluids (blood and interstitial fluid) and tissues. Finally, respiration may refer to the metabolic processes of converting the energy stored in biological molecules to usable energy in the form of ATP. This process may involve the consumption of oxygen and production of carbon dioxide, as seen in aerobic cellular respiration, or may not involve the consumption of oxygen, as in the case of anaerobic respiration.

Mechanism:

·        Breathing is the physical process of inhaling oxygen and exhaling carbon dioxide.

·        The mechanism of breathing involves two main processes: inspiration and expiration.

·        Inspiration occurs when the diaphragm and the external intercostal muscles contract.

·        Expiration occurs when the diaphragm and the intercostal muscles relax.

·        The relaxation and contraction around the lungs changes the entire volume of air inside the lungs, and so does the pressure.

·        If the pressure inside the lungs is more than the outside, the air rushes out. If the opposite happens, the air rushes in.

·        Due to the high elasticity of the lung tissue and low surface tension of moisture in the lungs, the lungs have higher compliance.