What type of tissue lines the kidney tubules?
areolar CT
simple columnar ET
nonkeratinized stratified squamous ET
simple squamous ET
simple cuboidal ET
The Correct Answer is E
A. areolar CT: Areolar connective tissue provides support and flexibility beneath epithelial layers but does not line tubular structures like the kidney tubules.
B. simple columnar ET: Simple columnar epithelium is specialized for absorption and secretion in areas like the gastrointestinal tract. Its taller cells are not suited for the thin, absorptive lining required in kidney tubules.
C. nonkeratinized stratified squamous ET: This epithelium protects against abrasion in areas such as the esophagus and oral cavity, but its multiple layers and thickness make it inappropriate for kidney tubules where rapid exchange occurs.
D. simple squamous ET: Simple squamous epithelium allows rapid diffusion and is found in structures like the glomerulus, but it is too thin for the majority of the kidney tubules, which require more absorptive and secretory capacity.
E. simple cuboidal ET: Simple cuboidal epithelium forms the lining of most kidney tubules. Its cube-shaped cells provide the surface area necessary for absorption and secretion while maintaining a single-cell layer for efficient transport of substances.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Pseudostratified columnar:Pseudostratified columnar epithelium appears multilayered due to nuclei positioned at different levels, but every cell contacts the basement membrane. This arrangement allows for functions such as secretion and movement of mucus, often aided by cilia in the respiratory tract.
B. Stratified cuboidal:Stratified cuboidal epithelium consists of two or more true layers of cuboidal cells, with only the basal layer in contact with the basement membrane. It provides protection and is typically found in ducts of glands.
C. Stratified columnar:Stratified columnar epithelium has multiple layers with only the deepest cells touching the basement membrane. It is rare and mainly found in parts of the pharynx, male urethra, and some glandular ducts.
D. Transitional:Transitional epithelium is specialized for stretching and recoiling, found in the urinary bladder. Cells change shape depending on tension, and not all layers contact the basement membrane.
Correct Answer is B
Explanation
A. collagen, elastin, and reticular fibers:These are the main types of fibers found in connective tissue, providing strength, elasticity, and support, but they do not represent all three main components.
B. ground substance, fibers, and cells:Connective tissue is composed of cells (such as fibroblasts, macrophages, and adipocytes), fibers (collagen, elastin, reticular), and ground substance (a gel-like material that fills the extracellular space). These three components work together to provide support, strength, and a medium for nutrient and waste exchange.
C. alveoli, fibrous capsule, and secretory cells:These structures are specific to glands or organs like the lungs, not general components of connective tissue.
D. fibroblasts, chondroblasts, and osteoblasts:These are specific types of connective tissue cells responsible for producing matrix in different connective tissues, but they do not account for fibers and ground substance, so they are not the three main components
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