Gas exchange occurs in which of the following structures?
bronchi
alveoli
nasal passages
larynx
The Correct Answer is B
B. The alveoli are tiny air sacs within the lungs where gas exchange occurs. Oxygen from inhaled air diffuses across the thin walls of the alveoli into the bloodstream, while carbon dioxide moves from the bloodstream into the alveoli to be exhaled.
A. The bronchi are the main airways that branch off from the trachea and lead to the lungs. While the bronchi play a crucial role in conducting air to and from the lungs, gas exchange does not occur in the bronchi themselves.
C. The nasal passages, also known as the nostrils or nares, are the passages through which air enters the respiratory system. While the nasal passages warm, humidify, and filter the air as it enters the body, gas exchange does not occur in this area.
D. The larynx, or voice box, is located at the top of the trachea and is involved in breathing, swallowing, and vocalization. However, gas exchange does not occur in the larynx.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
D. The primary cause of peptic ulcer disease is infection with Helicobacter pylori (H. pylori) bacteria. H. pylori infection is associated with the majority of peptic ulcers, particularly those in the stomach. This bacterium weakens the protective mucous lining of the stomach and duodenum, allowing stomach acid to damage the underlying tissue and form ulcers.
A. Spicy foods can exacerbate symptoms in some individuals with peptic ulcer disease but they are not a primary cause of the condition. Spicy foods can irritate the lining of the stomach or duodenum, potentially worsening symptoms, but they do not directly cause ulcers.
B. Stress was once thought to be a major factor in the development of peptic ulcers, but research has shown that while stress may aggravate symptoms, it is not a primary cause of peptic ulcer disease.
C. Excessive caffeine intake was also previously believed to be a major cause of peptic ulcer disease, but this is not entirely accurate. While caffeine can stimulate gastric acid secretion, leading to increased acidity in the stomach, it is not a primary cause of peptic ulcers.
Correct Answer is A
Explanation
A. Sucralfate works by forming a protective barrier over the ulcer site. It adheres to the ulcer, shielding it from the harmful effects of gastric acid, pepsin, and bile salts. This protection allows the ulcer to heal by preventing further irritation and damage.
B. Medications that prevent gastric acid secretion are typically proton pump inhibitors (PPIs) or H2 receptor antagonists. Sucralfate does not reduce or inhibit the production of gastric acid; instead, it protects the ulcer from the acid already present.
C. Antacids are the type of medication that neutralize gastric acid. Sucralfate does not neutralize acid; it acts locally at the ulcer site to create a protective coating.
D. Antibiotics are used to kill Helicobacter pylori, the bacteria often responsible for causing peptic ulcers. Sucralfate does not have antibacterial properties and does not target or eliminate bacteria.
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