Their large size and bone strength is necessary because these vertebrae support…. Trachea The trachea, also called the windpipe, is part of the passageway that supplies air to the lungs. Any prolonged blockage, even for a few…. Your legs are two of your most important body parts. They allow you to move and provide support for your upper body. The ductus deferens, or the vas deferens, is a male anatomical part; there are two of these ducts and their purpose is to carry ejaculatory sperm out….
Humans are sexual, meaning that both a male and a female are needed to reproduce. Each is equipped with specific organs capable of producing specific…. The spermatic cord is actually a bundle of fibers and tissues that form a cord-like structure that runs through the abdominal region down to the…. In male anatomy, the corpus spongiosum of penis is a mass of erectile tissue that lies along the underside of the penis and is located below the pair…. The coccygeal muscle is located in the pelvic cavity.
The lobes are further divided into segments and then into lobules, hexagonal divisions of the lungs that are the smallest subdivision visible to the naked eye. The lobes of the lungs : The right lung has three lobes and the left lung has two. The right lung is five centimeters shorter than the left lung to accommodate the diaphragm, which rises higher on the right side over the liver; it is also broader.
The volume, the total capacity, and the weight of the right lung is greater than that of the left. The right lung is divided into three lobes.
The upper lobe is the largest lobe of the right lung. It extends from the apex of the lung down to the horizontal and oblique fissures. It bears apical, anterior, and posterior bronchopulmonary segments. The middle lobe is the smallest lobe of the right lung, located between the horizontal and oblique fissures. It bears medial and lateral bronchopulmonary segments. The lower lobe is the bottom lobe of the right lung. It lies beneath the oblique fissure. It bears medial, lateral, superior, anterior, and posterior bronchopulmonary segments.
The Left Lung : This has a concave depression that accommodates the shape of the heart, called the cardiac notch. The human left lung is smaller and narrower that the right lung, and is divided into two lobes, an upper and a lower, by the oblique fissure. The left lung has only two formal lobes because of the space taken up in the left side of the chest cavity by the heart, though it does have the lingula, which is similar to a lobe.
The left lung has a depression on the medial side of its surface called the cardiac notch, a concave impression molded to accommodate the shape of the heart.
Alveoli are small sacs where the gas-exchange of CO 2 and O 2 takes place. There is an intricate web of blood vessels which wrap around each sac, allowing the transfer of gases to take place through the extremely thin walls of the alveoli. The total surface area of the alveoli is very, very large - roughly the size of a tennis court.
The lungs are not equal in size. The right lung is shorter, because the liver sits high, tucked under the ribcase , but it is broader than the left. The left lung is smaller because of the space taken up by the heart see diaphragm for an image of this. Each lung is separated into lobes branching off the main bronchus; the right lung has three lobes, while the left has only two lobes.
As the bronchi branch out, the total area of the two new branches is larger than its parent bronchus, making it extremely easy for the air to rush into the lungs. Each lung is encased in a sack of tissue called the pleura.
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