Alveoli are kept dry by absorption of excess liquid by which structure?

The absorption of excess liquid in the alveoli is primarily facilitated by blood capillaries. Alveoli, the tiny air sacs in the lungs where gas exchange occurs, rely on a finely tuned balance of fluid to function effectively. The presence of excess liquid in the alveoli would hinder gas exchange by increasing the distance oxygen and carbon dioxide must diffuse, thus affecting overall lung function.

Blood capillaries surround the alveoli and play a crucial role in this process. They maintain the appropriate fluid levels by absorbing excess fluid through osmotic pressure. The presence of proteins in the blood increases the osmolarity inside the capillaries, which draws fluid from the alveolar spaces into the circulating blood, keeping the alveoli dry and ensuring efficient gas exchange.

Other structures, while related to the respiratory system, do not directly participate in the absorption of excess liquid in the alveoli. Bronchi do not have a significant role in fluid management at the alveolar level; their function is primarily related to airflow and conducting air to and from the alveoli. Alveolar sacs are part of the alveolar structure but do not contribute to fluid absorption. The pleural cavity, while it does contain pleural fluid to lubricate lung movement, is not involved in