9
Question
The surface area of a human lung is made larger by alveoli and is approximately the size of a:
The surface area of a human lung is made larger by alveoli and is approximately the size of a:
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Solution
The correct option is D Tennis court
The lungs are large, paired, spongy organs present in the thoracic (chest) cavity. The right lung is divided into three lobes, the left lung into two lobes. Because the lung consists largely of air tubes and elastic tissue, it is a spongy, elastic organ with a very large internal surface area for gas exchange. Inside the lungs the bronchi branch, becoming smaller and more in number. These branches give rise to more than 1 million tiny bronchioles in each lung. Each bronchiole ends in a cluster of tiny air sacs, the alveoli. Each human lung contains more than 300 million alveoli, which provide an internal surface area the approximate size of a tennis court. Each alveolus is lined by an extremely thin, single layer of epithelial cells.Hence, the correct answer is 'D'.
The lungs are large, paired, spongy organs present in the thoracic (chest) cavity. The right lung is divided into three lobes, the left lung into two lobes. Because the lung consists largely of air tubes and elastic tissue, it is a spongy, elastic organ with a very large internal surface area for gas exchange. Inside the lungs the bronchi branch, becoming smaller and more in number. These branches give rise to more than 1 million tiny bronchioles in each lung. Each bronchiole ends in a cluster of tiny air sacs, the alveoli. Each human lung contains more than 300 million alveoli, which provide an internal surface area the approximate size of a tennis court. Each alveolus is lined by an extremely thin, single layer of epithelial cells.
Hence, the correct answer is 'D'.
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