The detergent-like substance that keeps the alveoli from collapsing between breaths because it reduces the surface tension of the water film in the alveoli is called a. lecithin, b. bile, c. surfactant, d. reluctant.

Verified step by step guidance

1. Identify the function of the substance mentioned in the question, which is to prevent alveoli from collapsing by reducing the surface tension of the water film.
2. Recognize that the alveoli are tiny air sacs in the lungs where gas exchange occurs, and maintaining their structure is crucial for effective breathing.
3. Understand that a substance that reduces surface tension will help keep the alveoli open during the breathing process.
4. Recall that surfactant is a compound produced in the lungs that decreases the surface tension within the alveoli, helping them to stay open and not collapse after exhalation.
5. Match the function described in the question to the correct term from the options provided, which is known to perform this specific role in the respiratory system.

Key Concepts

Surfactant

Surfactant is a substance that reduces surface tension in liquids. In the lungs, surfactant is produced by alveolar cells and plays a crucial role in preventing the collapse of alveoli by decreasing the surface tension of the fluid lining them. This allows for easier expansion during inhalation and helps maintain proper lung function.

Alveoli

Alveoli are tiny air sacs in the lungs where gas exchange occurs. They are surrounded by a thin layer of fluid, which is essential for the diffusion of oxygen and carbon dioxide. The presence of surfactant in the alveoli is vital for keeping them open and functional, ensuring efficient respiratory processes.

Surface Tension

Surface tension is the cohesive force at the surface of a liquid that causes it to behave like a stretched elastic membrane. In the context of the alveoli, high surface tension can lead to collapse, making it difficult for the lungs to inflate. Surfactant reduces this tension, allowing the alveoli to remain open and facilitating normal breathing.