Question

lungs alvoeli are coverd with blood capellaries. give reason​

Answer 1

Answer:

The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly. The alveoli have a very large total surface area and a very good blood supply, provided by the dense network of capillaries that surround them.

Explanation:

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Answer 2

1. Alveoli present in the lungs are covered with blood capillaries so that the exchange of gases can takes place between the membranes of the alveoli and the surroundings of capillaries. The blood capillaries covering alveoli have a low oxygen and high carbon dioxide concentrations. This allows oxygen to diffuse out of the blood.

2. The walls of trachea are strengthened by several C- shaped rings of cartilage. The cartilage rings provide flexibility. They keep the trachea open, thus facilitating continuous airflow. In the absence of cartilage rings, the trachea would collapse under the partial vacuum formed while inhaling.

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