Explain two ways in which the alveoli are adapted to increase the efficiency of has exchange ?

1. Large surface area: The alveoli are tiny air sacs in the lungs that are surrounded by a network of capillaries. This arrangement provides a large surface area for gas exchange to occur. The large surface area allows for more oxygen to be absorbed into the bloodstream and for more carbon dioxide to be released from the bloodstream, increasing the efficiency of gas exchange.

2. Thin walls: The walls of the alveoli are extremely thin, only one cell thick. This thinness allows for a shorter distance for gases to diffuse between the air in the alveoli and the blood in the capillaries. This short diffusion distance speeds up the exchange of gases, making the process more efficient. Additionally, the thin walls allow for a greater concentration gradient of gases, further enhancing the efficiency of gas exchange.

1. Thin walls: The walls of the alveoli are only one cell thick, which allows gases to diffuse easily between the air and the blood. This is essential for efficient gas exchange because it allows the blood to take up as much oxygen as possible from the air and release as much carbon dioxide as possible into the air.
2. Large surface area: The alveoli have a very large surface area, which allows for a lot of gas exchange to occur. This is important because it ensures that the blood can get enough oxygen and release enough carbon dioxide to meet the body's needs.