ANIMAL PHYSIOLOGY
DIGESTION IN DIFFERENT ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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thin microscopic sacs located at the terminal end to respiratory system.
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smaller branches inside the lung
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large organs responsible for gas exchange
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large muscle separating the chest from the abdomen
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Detailed explanation-1: -Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
Detailed explanation-2: -A pulmonary alveolus (plural: alveoli, from Latin alveolus, “little cavity"), also known as an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place.
Detailed explanation-3: -Each alveolus (singular of alveoli) is about 200 micrometers (µm) or 0.007 centimeters (cm) in diameter. Each alveolus is cup-shaped with very thin walls. It’s surrounded by networks of blood vessels called capillaries that also have thin walls.
Detailed explanation-4: -In your lungs, the main airways (bronchi) branch off into smaller and smaller passageways-the smallest, called bronchioles, lead to tiny air sacs (alveoli).
Detailed explanation-5: -The alveolar sacs are lined by the squamous type alveolar type I cells (or type I pneumocytes) and cuboidal alveolar type II (or type II pneumocytes) cells.