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What animal has four or five air sacs attached to each lung?
Birds.
Why do lung have air sacs?
For oxygen exchange
Why is it better for a lung to consist of thousands of tiny air sacs rather than one large air sac?
Consisting of thousands of tiny air sacs increases the surface area inside of the lung which allows for better gas exchange. If the lung was made of one larger air sac, you would not be able to exchange as many gases (oxygen/CO2) with each breath.
What is the job of the air sacs?
A tube that carries air from the windpipe to the lung
What are the air sacs in a mammalian lung across which gas exchange occurs?
Alveoli
Why dos the lung have many of these air sacs?
It holds all the air for your body and air goes through it to the body.
What are small air sacs of lung tissue called?
Alveoli (pulmonis) or just alveoli.
What is the structure and function of the lungs?
It has many balloon-like sacs that can hold air.
What does a bird's lung look like?
Birds have very different lungs than mammals because birds don't have a diaphragm. Air is pulled in by expansion of the rib cage and is drawn first into the lung, which instead of being arranged in blind-ended sacs (alveoli) are arranged into tubes. A second draw pulls the air from the lungs and into air sacs throughout the body cavities where additional oxygen is pulled from the air. The air is then expelled from the air sacs through the pharynx back into the atmosphere.
Which struscture in the lung resemble bunches of hollow grapes?
The alveoli are air sacs that could be said to resemble grapes.
How does emphysema affect the structure and function of the lung compared to a normal lung?
Emphysema is a lung disease that damages the air sacs in the lungs, making them less elastic and causing them to collapse. This affects the structure of the lung by reducing its ability to expand and contract properly. As a result, the lung's function is impaired, leading to difficulty breathing and decreased oxygen exchange. In comparison, a normal lung has healthy air sacs that can expand and contract easily, allowing for efficient breathing and oxygen exchange.
Describe the pleural coverings of the lung and explain their purpose?
Each lung is suspended in its own pleural cavity and rests on the muscular diaphragm. The medial surface has a hilus (indentation) where the bronchi enter. Because of the shape and location of the heart, the lungs differ in size and shape. The left lung is smaller with 2 lobes, the right has 3 lobes. Lungs are mostly air spaces and connective tissue. The lung contains the air sacs where oxygen diffuses from air sacs into the blood vessels and waste carbon dioxide diffuses from the blood vessels into the air sacs. Each lung exists in a pleural cavity, a serous membrane compartment which prevents friction damage as the lungs expand and contract during breathing. The visceral pleura is the membrane fused to the outer surface of the lung; the parietal pleura is the membrane which lines the body wall. Between the two membranes in the pleural fluid. See related link for source.
