___ epithelium allows for rapid diffusion of oxygen and carbon dioxide through the alveoli of the lungs.
Nonkeratinized stratified squamous
Simple columnar
Simple squamous
Simple cuboidal
The Correct Answer is C
A. Nonkeratinized stratified squamous: This epithelium type is found in areas subject to friction and abrasion, such as the esophagus and oral cavity. Its multiple layers make it unsuitable for efficient gas exchange, as diffusion is slowed by the thickness of the tissue.
B. Simple columnar: Simple columnar epithelium is specialized for absorption and secretion, commonly found in the gastrointestinal tract. Its tall cell structure is not ideal for rapid diffusion, making it poorly suited for alveolar gas exchange.
C. Simple squamous: Simple squamous epithelium consists of a single, thin layer of flat cells. Its delicate structure provides a minimal barrier for diffusion, allowing oxygen and carbon dioxide to rapidly pass through the alveolar walls during respiration.
D. Simple cuboidal: Simple cuboidal epithelium is found in glands and kidney tubules where secretion and absorption occur. Its cube-shaped cells are thicker than squamous cells, creating a greater distance for gases to diffuse, which reduces efficiency in the lungs.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. centromere:The centromere is the region of a chromosome where sister chromatids are tightly joined after DNA replication. It plays a critical role in ensuring proper alignment and separation of chromatids during cell division.
B. centrosome:The centrosome is an organelle that organizes microtubules and helps form the mitotic spindle during cell division. It is not responsible for holding sister chromatids together.
C. centriole:Centrioles are cylindrical structures within the centrosome that aid in spindle fiber formation. They assist in chromosome movement but do not act as the attachment site between sister chromatids.
D. kinetochore:The kinetochore is a protein complex assembled on the centromere that attaches to spindle fibers. It facilitates chromatid movement but is not the structure that holds sister chromatids together.
Correct Answer is E
Explanation
A. tight junctions:Tight junctions form a seal between epithelial cells, preventing leakage of substances between them and helping maintain distinct apical and basal cell surfaces. They are essential for barrier functions in epithelial tissue.
B. gap junctions:Gap junctions provide channels for communication and ion exchange between cells rather than strong attachment. While important for coordination, they are not the main structures that firmly hold epithelial cells together.
C. desmosomes:Desmosomes are anchoring junctions that strongly attach epithelial cells to each other, providing structural integrity and resistance to mechanical stress. They are vital in tissues subject to stretching.
D. both A and B:While tight junctions are involved in attachment, gap junctions serve mainly for communication rather than physical adhesion.
E. both A and C:Epithelial cells are held together primarily by tight junctions for sealing and desmosomes for strength, combining barrier function with mechanical support.
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