Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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- Describe the function of these terms and describe where they are located: main bronchus, trachea, alveoli.arrow_forwardA partial pressure gradient of oxygen exists between ________. a. air and lungs b. lungs and metabolically active tissues c. air at sea level and air at high altitudes d. all of the abovearrow_forwardAsthma is a very common disease. It is characterized by widespread narrowing of the bronchioles and formation of mucus plugs, producing symptoms of wheezing, shortness of breath, and coughing, and is caused by the release of factors during an allergic response. Explain why the narrowing of bronchioles, rather than that of the larger bronchi, is the source of the airflow restriction, and why inhaling dilating agents can bring relief during an asthma attack.arrow_forward
- Fig. 2.1 shows photomicrographs of lung tissue at the same magnification. One shows healthylung tissue and the other shows lung tissue from a person with COPD. Line AB shows the diameter of one healthy alveolus. Line CD shows the diameter of an area oflung where the alveoli have been destroyed. The real diameter of healthy alveolus is 200 µm.If line AB in the picture is 2 cm, calculate the magnification of the picture...... Magnification: …………………… please solve with step max 15-20 minutes and no reject thank uarrow_forwardPneumonia interferes with CO2 elimination and O₂ uptake primarily by: Slowing diffusion by reducing the surface area of alveoli Reducing air flow into and out of the lungs by reducing the cross sectional area of the airways Decreasing the partial pressure of the air in the alveoli. O loss of elasticity of the lungs making it difficult to move air into and out of the lungs O increasing the diffusion distance due to buildup of fluid within the alveoli Which of the following is not part of the respiratory membrane? all of the other answers are part of the respiratory membrane the squamous cells of the alveoli areolar connective tissue a basement membrane the endothelium of the capillaryarrow_forwardIn cytokine storm, what are three things that happen to reduce gas exchange? swelling increases distance between alveoli & circulatory system oxygen builds up in the alveoli red blood cells invade the alveoli carbon dioxide builds up in the alveoli fluid fills up alveoli scar tissue forms making lungs more flexible hyaline membrane forms making lungs less flexiblearrow_forward
- What are the passageways leading from the nose to where oxygen can be absorbed into the blood stream? Explain how both diffusion and convection are necessary to deliver oxygen from the nasal cavity to the cells of the body.arrow_forwardWhich of the following situation would you expect in a patient with a type 2 cells dysfunction? The ciliated epithelium of the trachea would lack its normal watery layer. The resistance in the conducting airways would increase. Some alveoli may collapse and prevent ventilation in that part of the lungs. The lungs would become too easily stretched out. The expiratory reserve volume would shrink. Please consider providing detailed explanations of both correct and incorrect options.arrow_forwardWatch this video (http://openstaxcollege.org/l/oxyblood) to see the transport of oxygen from the lungs tothe tissues. Why is oxygenated blood bright red, whereasdeoxygenated blood tends to be more of a purple color?arrow_forward
- The alveoli in the lungs where gas exchange occurs are composed of a simple squamous epithelium. What is thestructure of this tissue type, and how does its structure make gas exchange possible?arrow_forwardMucous membranes (pseudostratified ciliated columnar epithelia) line most upper respiratory tract structures. Although these membranes filter the air by trapping pathogens in mucus, they are very delicate. Pieces of food passing through the oropharynx and laryngopharynx could damage this type of epithelium. Predict which type of epithelium protects the lining of the oropharynx and laryngopharynx.arrow_forwardEmphysema is characterized by destructive changes of alveolar walls resulting in large air-filled spaces due to overinflation. There is a loss of lung elasticity, decreased gas exchange, and large air-filled spaces. Pneumonia is an acute inflammation of the lungs with the alveoli and bronchioles becoming plugged with an exudate (fluid), and the alveolar cell membranes thickening. In Figure, identify which alveolar section came from a person with no lung disease (normal alveoli), with emphysema, or with pneumonia.arrow_forward
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