Question

What is partial pressure? How does it help in gaseous exchange during respiration?

Answer 1

Blood that is low in oxygen concentration and high in carbon dioxide fixation goes through gas exchange with air in the lungs. The air in the lungs has a higher concentration of oxygen than that of oxygen-drained blood and a lower concentration of carbon dioxide. This concentration gradient considers gas exchange during respiration.

Complete Answer:
Partial pressure is a measure of the concentration of the individual components in a combination of gases. The total pressure applied by the combination is the sum of the partial pressures of the components in the mixture. The rate of diffusion of a gas is proportional to its partial pressure inside the absolute gas mixture.

Partial pressure is related with the gaseous exchange i.e. as air moves into the alveoli, water vapor and carbon dioxide are mixed, and that lessens the partial pressure of oxygen to around 100 mmHg in the alveolar gas.

Talking about the human body, the respiratory cycle can be better perceived by looking at the properties of gases. Gases move unreservedly, yet gas particles are continually hitting the wall of their vessel, consequently creating gas pressure.

Additional information: Air is a combination of gases, mainly nitrogen (N2; 78.6 %), oxygen (O2; 20.9 %), water vapor (H2O; 0.5 %), and carbon dioxide (CO2; 0.04 %). Each gas component of that mixture applies a weight. The weight for an individual gas in the mixture is the fractional weight (partial pressure) of that gas. Roughly 21 % of atmospheric gas is oxygen. Carbon dioxide, be that as it may, is found in moderately limited quantities, 0.04 %. The partial pressure for oxygen is a lot more noteworthy than that of carbon dioxide. The partial pressure of any gas can be determined by:

P = (P_{atm}) × (percent content in mixture)

Note: Disturbance in partial pressure in human body may lead to some respiratory insufficiency refers to conditions that reduce your body's ability to perform gas exchange, which includes: Chronic Obstructive Pulmonary Disease (COPD): a progressive lung disease that includes emphysema and chronic bronchitis. Asthma and rare genetic conditions, such as cystic fibrosis, can also lead to COPD.