Lung Diagram Biography
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Each cell in an animal’s body must receive O2 and give off CO2. This is easier for smaller organisms. In the vertebrates, the blood carries O2 and CO2 to and from the cells, but these gases must also be exchanged with the outside air or water. In insects, the tracheal system takes air directly to the organs and O2 is usually not carried in the blood. Mammals and some other vertebrates have have lungs to exchange air. However, the lungs are ventilated differently in different groups of vertebrates. For example, a frog opens its nostrils and expands the floor of its mouth to draw air into its mouth. Then it closes its nostrils and uses the floor of its mouth to push O2 into its lungs. Mammals are unique in possessing a diaphragm to pull O2 into the lungs. Even birds do not have a diaphragm between their thorax and abdomen, so their liver and heart are almost touching, and if their liver becomes enlarged for some reason, it can rub on the bird’s heart. In mammals, as the diaphragm contracts and the rib cage rises, a negative pressure is created in the chest cavity causing the lungs to expand and air to be drawn in. Air first passes into the nostrils where it is filtered by the nasal hairs and warmed and humidified in the nasal cavity and sinuses. From there, the air passes through the pharynx, which is shared with the digestive tract. Many students have trouble with the pronunciation of this word. It is pronounced “ fair—inks ,” and you need to learn how to correctly pronounce it. Air next passes through the larynx, (pronounced as above, but with an “l”) also called the Adam’s apple or voice box, and which contains the vocal cords. The vocal cords are under tension, and a change in tension causes a change in pitch as air passes over them and they vibrate. An inflammation of the larynx is called laryngitis.
The human lungs are the organs of respiration in humans. Humans have two lungs, a right lung and a left lung. The right lung consists of three lobes while the left lung is slightly smaller consisting of only two lobes (the left lung has a "cardiac notch" allowing space for the heart within the chest). Together, the lungs contain approximately 2,400 kilometres (1,500 mi) of airways and 300 to 500 million alveoli, having a total surface area of about 70 square metres (750 sq ft) to 100 square metres (1076.39 sq ft) (8,4 x 8,4 m) in adults — roughly the same area as one side of a tennis court. Furthermore, if all of the capillaries that surround the alveoli were unwound and laid end to end, they would extend for about 992 kilometres (616 mi). The lungs together weigh approximately 2.3 kilograms (5.1 lb), with the right lung weighing more than the left. The pleural cavity is the potential space between the two serous membranes, (pleurae) of the lungs; the parietal pleura, lining the inner wall of the thoracic cage, and thevisceral pleura, lining the organs themselves–the lungs. The respiratory system includes the conducting zone, which consists of all parts of the airway that conducts air into the lungs. The parenchyma of the lung, only relates to the functional alveolar tissue, but the term is often used to refer to all lung tissue, including the respiratory bronchioles, alveolar ducts,terminal bronchioles, and all connecting tissues. As seen on the surface, this fissure begins on the mediastinal surface of the lung at the upper and posterior part of the hilum, and runs backward and upward to theposterior border, which it crosses at a point about 6 cm. below the apex. It then extends downward and forward over the costal surface, and reaches the lower border a little behind its anterior extremity, and its further course can be followed upward and backward across the mediastinal surface as far as the lower part of the hilum.On the mediastinal surface, immediately above the hilum, is a well-marked curved furrow produced by the aortic arch, and running upward from this toward the apex is a groove accommodating the left subclavian artery; a slight impression in front of the latter and close to the margin of the lung lodges the left innominate vein. Behind the hilum and pulmonary ligament is a vertical furrow produced by thedescending aorta, and in front of this, near the base of the lung, the lower part of theesophagus causes a shallow impression.
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
Lung Diagram Lungs Diagram of a Smoker after Smoking Cancer Anatomy And Heart Drawing Images AFter Smoking Wee
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