Question
Which one of the following epithelial cell types is primarily located in the tracheal mucosa of a healthy adult human?
The correct answer is
Ciliated pseudostratified columnar
Tracheal Epithelial Cells Identification
The question asks to identify the primary epithelial cell type lining the tracheal mucosa in a healthy adult human.
Epithelial Cell Type Analysis
Let's analyze the options based on typical locations:
- Transitional epithelium: Found mainly in the urinary tract (bladder, ureters) where distension occurs.
- Keratinized stratified squamous epithelium: Forms the outer layer of the skin, providing protection.
- Simple squamous epithelium: A single layer of flat cells, found where diffusion or filtration is important, such as in lung alveoli and capillary linings.
- Ciliated pseudostratified columnar epithelium: This type, characterized by cells appearing to be in multiple layers but all attached to the basement membrane, with cilia on the apical surface, is the hallmark lining of most of the respiratory tract, including the trachea. Its cilia help move mucus and debris upward.
Conclusion on Tracheal Lining
Therefore, the epithelial cell type primarily located in the tracheal mucosa of a healthy adult human is ciliated pseudostratified columnar epithelium.
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Important Questions from Respiratory System
- The vital capacity, tidal volume, and inspiratory reserve volume of the lungs of a healthy individual are 4600 milliliters (mL), 500 mL, and 2500 mL, respectively. The expiratory reserve volume of the lungs of this individual is _______ mL.
(Round off to the nearest integer) - The volume percentage of oxygen in inspired air is $20 \%$ and that of expired air is $16 \%$. A person is breathing at a rate of $12$ breaths per minute. Each breath is $500 \text{ ml}$ in volume. The cardiac output is $5 \text{ liters}$ per minute.
Assuming ideal, healthy lung and cardiac conditions, what is the change in percentage of oxygen in blood over $1$ minute? (Round off the answer to one decimal place.) - Which of the following relations is/are CORRECT in terms of various lung volume measurements?
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