The following statements about alveoli are true:

1. They are tiny sacs within the lungs: This is true. Alveoli are small sacs located at the end of bronchial tubes in the lungs. They are the site where gas exchange occurs in the respiratory system.

2. They expand when you breathe out: This is false. Alveoli expand when you breathe in, allowing them to fill with air and facilitate gas exchange. When you breathe out, they contract, expelling the carbon dioxide-rich air.

3. Their walls are membranes that allow oxygen and carbon dioxide to diffuse through: This is true. The walls of the alveoli, also known as the alveolar membrane, are extremely thin and permeable, allowing oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood.

4. They are not well connected to blood vessels: This is false. Alveoli are very well connected to a network of capillaries (tiny blood vessels). This close proximity to the blood supply allows for efficient gas exchange.

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The following statements about alveoli are true:

1. They are tiny sacs within the lungs: This is true. Alveoli are small sacs located at the end of bronchial tubes in the lungs. They are the site where gas exchange occurs in the respiratory system.

2. They expand when you breathe out: This is false. Alveoli expand when you breathe in, allowing them to fill with air and facilitate gas exchange. When you breathe out, they contract, expelling the carbon dioxide-rich air.

3. Their walls are membranes that allow oxygen and carbon dioxide to diffuse through: This is true. The walls of the alveoli, also known as the alveolar membrane, are extremely thin and permeable, allowing oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood.

4. They are not well connected to blood vessels: This is false. Alveoli are very well connected to a network of capillaries (tiny blood vessels). This close proximity to the blood supply allows for efficient gas exchange.

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The following statements about alveoli are true:

1. They are tiny sacs within the lungs: This is true. Alveoli are small sacs located at the end of bronchial tubes in the lungs. They are the site where gas exchange occurs in the respiratory system.

2. They expand when you breathe out: This is false. Alveoli expand when you breathe in, allowing them to fill with air and facilitate gas exchange. When you breathe out, they contract, expelling the carbon dioxide-rich air.

3. Their walls are membranes that allow oxygen and carbon dioxide to diffuse through: This is true. The walls of the alveoli, also known as the alveolar membrane, are extremely thin and permeable, allowing oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood.

4. They are not well connected to blood vessels: This is false. Alveoli are very well connected to a network of capillaries (tiny blood vessels). This close proximity to the blood supply allows for efficient gas exchange.

Recall which of the following statements about alveoli are true.They are tiny sacs within the lungsThey expand when you breathe outTheir walls are membranes that allow oxygen and carbon dioxide to diffuse throughThey are not well connected to blood vessels

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