Mucus plays an important role in cleansing inhaled air. It is produced by
squamous alveolar cells
goblet cells
great alveolar cells
cilated cells
the pleurae
The Correct Answer is B
A. Squamous alveolar cells: Squamous alveolar cells (type I pneumocytes) form the thin lining of alveoli to facilitate gas exchange. They do not produce mucus and are not involved in air cleansing.
B. Goblet cells: Goblet cells are specialized epithelial cells found in the respiratory tract that secrete mucus. This mucus traps dust, pathogens, and other particles in inhaled air, playing a critical role in respiratory defense.
C. Great alveolar cells: Great alveolar cells (type II pneumocytes) secrete pulmonary surfactant to reduce alveolar surface tension. They do not produce mucus or participate directly in cleansing inhaled air.
D. Ciliated cells: Ciliated epithelial cells help move mucus along the respiratory tract through coordinated beating of cilia, but they do not secrete mucus themselves.
E. The pleurae: The pleurae are membranes surrounding the lungs and lining the thoracic cavity. They produce pleural fluid to reduce friction during breathing but do not produce mucus.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The image shows a single cycle of an electrocardiogram (ECG or EKG), which represents the electrical activity of the heart.
A (P wave):Represents atrial depolarization, which triggers the contraction of the atria.
B, C, D (QRS complex):Represents ventricular depolarization, which triggers the main contraction of the ventricles.
E (T wave):Represents ventricular repolarization, which signifies the electrical recovery and relaxation of the ventricles.
Correct Answer is A
Explanation
This phenomenon is called molecular mimicry, where antibodies generated against foreign antigens (like viruses or bacteria) mistakenly recognize similar structures on the body’s own cells. This cross-reactivity can trigger an autoimmune response, leading the immune system to attack healthy tissues. Conditions such as rheumatic fever or type 1 diabetes can result from this type of immune misidentification.
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