What take oxygen during the lung respiration and oxygen gas is dissolved in the blood stream?

During lung respiration, oxygen is taken in through the alveoli, tiny air sacs in the lungs where gas exchange occurs. Oxygen diffuses across the alveolar membrane into the bloodstream, where it binds to hemoglobin in red blood cells. A small portion of oxygen also dissolves directly in the plasma. This process is crucial for delivering oxygen to body tissues for cellular respiration.