Question 22

Oxygen is transported from the air to the blood in the lungs through diffusion.

Diffusion is the process that allows oxygen to move from an area of higher concentration in the air within the lungs to an area of lower concentration in the blood. This movement is essential for respiration and cellular metabolism.

A) osmosis

Osmosis refers to the movement of water molecules through a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. It is not the correct process for the transport of oxygen, as it specifically relates to water, not gases.

B) diffusion

Diffusion is the correct process by which oxygen is transferred from the air in the lungs into the bloodstream. This gas exchange occurs across the alveolar membranes, where oxygen concentration is higher in the alveoli compared to the blood, allowing for efficient transport.

C) dissipation

Dissipation generally refers to the process of spreading out or scattering energy, often in the context of heat. It does not pertain to the transport of gases like oxygen in the lungs, making this option incorrect.

D) reverse osmosis

Reverse osmosis is a water purification process that involves the movement of water through a semipermeable membrane against the concentration gradient, typically used to remove impurities. It is unrelated to the transport of oxygen in the lungs, thereby rendering it incorrect.

Conclusion

The process of diffusion is vital for the transfer of oxygen from the air in the lungs to the blood, as it relies on the concentration gradient. In contrast, osmosis, dissipation, and reverse osmosis do not apply to gas transport and therefore are incorrect. Understanding diffusion is crucial for comprehending respiratory physiology and the mechanisms of gas exchange.