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 C
Explanation
C. The spacer helps to deliver more medication to the lungs by holding the medication in the chamber, allowing the patient to inhale it more slowly and deeply. This results in better deposition of the medication in the lower airways and reduces the amount of medication that is deposited in the mouth and throat.
A. The primary purpose of the spacer is to increase the amount of medication that reaches the lungs and to reduce the amount deposited in the oropharynx (throat). The spacer helps to ensure that more medication is delivered directly to the airways where it is needed, thereby enhancing the effectiveness of the treatment and reducing side effects.
B. The exhalation slots or vents on a spacer are designed to allow the patient to exhale easily without removing the device from the mouth. The lips should form a tight seal around the mouthpiece of the spacer to ensure effective inhalation, but the exhalation slots should not be intentionally covered.
D. When using a spacer with an MDI, the patient should inhale slowly and deeply. Rapid inhalation can cause the medication to be deposited in the upper airways rather than reaching the lungs. A slow and deep inhalation allows for better medication delivery to the lower airways.
Correct Answer is ["A","C","E"]
Explanation
A. Diminished breath sounds can occur in emphysema due to decreased air movement through damaged and enlarged air sacs (alveoli). The destruction of alveolar walls reduces the surface area available for gas exchange and can result in decreased breath sounds.
C. Patients with emphysema may use accessory muscles, such as neck and shoulder muscles, to assist with breathing during periods of respiratory distress. These muscles are recruited to help increase the size of the thoracic cavity and improve airflow.
E. A barrel-shaped chest is a common physical finding in patients with emphysema. It results from hyperinflation of the lungs and is characterized by an increased anterior-posterior diameter of the chest. This change in chest shape is due to air trapping in the lungs, leading to overinflation of the alveoli and increased residual volume.
B. Ruddy skin color, which refers to a reddish or flushed complexion, is not typically associated with emphysema. Instead, patients with emphysema may exhibit cyanosis (bluish discoloration of the skin) during periods of hypoxemia (low oxygen levels).
D. Excess mucus production (mucus hypersecretion) is a characteristic feature of chronic bronchitis, which is often present alongside emphysema in chronic obstructive pulmonary disease (COPD) but it is not typically a primary feature of emphysema itself.
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