Reply To: Week 7 – Discussion Board 2

Welcome To Interpreters Associates, Inc. Forums Week 7 – Discussion Board 2 Reply To: Week 7 – Discussion Board 2


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Sara Abbasova # Posted on October 21, 2022 at 9:55 pm

Alveoli are microscopic air sacs in the lungs that take in oxygen, the incoming energy, and release carbon dioxide, the outgoing waste product – this process is done through respiration, the person inhales oxygen, and exhales carbon dioxide. They are the center of the respiratory system’s gas exchange. The alveoli cover a surface of about 100 square meters if put all together, this large area is necessary because the lungs take in about five to eight liters of oxygen per minute. When a person is resting, they send about 0.3 liters of oxygen to the blood per minute.

The right lung has three sections called the lobes, whereas the left lung only has two. These sections look like tree limbs, the larger branches in the lobes are called the bronchi. The bronchi, then, are divided into smaller branches which are the bronchioles. At the end of those, are the alveoli which are microscopic bubbles in a cluster that are connected through the alveolar duct. The alveoli are organized into bunches that are called the alveolar sac, they touch each other and the number of alveolar sacs gives the lungs their spongy consistency.

The epithelium (outside layer) is composed of type 1 and type 2 cells. Type 1 covers about 95% of the alveolar surface and makes up the air-blood barrier. The type 2 cells are smaller and they produce the surfactant that coats the inside surface of the alveolus, producing surface tension. Type 2 can also serve as stem cells if necessary to repair any injured alveoli.