Question

What is the partial pressure of oxygen in the alveoli of lungs?

Answer 1

In the lungs, blood with a low oxygen concentration and a high carbon dioxide fixation undergoes gas exchange with air. The air in the lungs has a higher concentration of oxygen and a lower concentration of carbon dioxide than oxygen-drained blood. The gas exchange during respiration is taken into account in this concentration gradient.

Complete answer:
The partial pressure of a mixture of gases is a measure of the concentration of the constituent components. The sum of the partial pressures of the components in the mixture is the total pressure applied by the combination. The rate of diffusion of a gas inside an absolute gas mixture is related to its partial pressure.
The partial pressure of oxygen in the lungs' alveoli is higher than the partial pressure of oxygen in the blood. Alveoli have a $p{O_2}$ of $104$ mm Hg, whereas oxygenated blood has a $p{O_2}$ of $95$ mm Hg and deoxygenated blood has a $p{O_2}$ of $40$ mm Hg. As a result, it promotes ${O_2}$ diffusion from alveoli to tissues.
Partial pressure is related to gaseous exchange, which means that as air travels into the alveoli, water vapour and carbon dioxide combine, lowering the partial pressure of oxygen in the alveolar gas to roughly $100$ mmHg.
When it comes to the human body, looking at the qualities of gases can help you understand the respiratory cycle. Gases travel freely, but gas particles constantly collide with the vessel's wall, causing gas pressure to build up.

Note:
Some respiratory insufficiency can be caused by a change in partial pressure in the human body. Respiratory insufficiency refers to conditions that limit your body's ability to complete gas exchange, such as: COPD stands for chronic obstructive pulmonary disease, which encompasses emphysema and chronic bronchitis. COPD can be caused by asthma and rare hereditary diseases like cystic fibrosis.