Which of the following is NOT one of the functions of the skin?
Delivers important sensory information about our environmental conditions to our brains.
Holds a portion of the blood's total volume to be shunted (diverted to other organs when needed.)
Gives the body its overall shape, loss of this function can be seen with the drooping of skin with age.
Conducts chemical reactions using the suns energy to initiate vitamin D synthesis.
The Correct Answer is C
A. Delivers important sensory information about our environmental conditions to our brains: The skin contains sensory receptors that detect touch, pressure, temperature, and pain, sending this information to the brain for interpretation.
B. Holds a portion of the blood's total volume to be shunted (diverted) to other organs when needed: The skin’s extensive vascular network can store blood and redirect it to vital organs during times of need, helping regulate blood pressure and thermoregulation.
C. Gives the body its overall shape, loss of this function can be seen with the drooping of skin with age: While the skin contributes to appearance and elasticity, the body’s overall shape is primarily determined by the skeletal system and underlying musculature.
D. Conducts chemical reactions using the sun’s energy to initiate vitamin D synthesis: The skin is essential for the synthesis of vitamin D when exposed to UVB rays from sunlight, which is a critical metabolic function supporting calcium homeostasis and bone health.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. metaphase plate:The metaphase plate is the imaginary plane in the middle of the cell where chromosomes align during metaphase. It does not involve actin filaments or the separation of daughter cells.
B. cleavage furrow:The cleavage furrow is formed by a contractile ring of actin filaments that tightens to constrict the cell membrane. This process physically separates the cytoplasm, resulting in two distinct daughter cells during cytokinesis.
C. mitotic spindle:The mitotic spindle is composed of microtubules that attach to chromosomes and move them during mitosis. It functions in chromosome segregation, not in the physical pinching of the cytoplasm.
D. centrosome:The centrosome is the microtubule-organizing center that helps form the mitotic spindle. While crucial in mitosis, it does not participate in the contraction needed for cell cleavage.
E. centromere:The centromere is the region where sister chromatids are attached and where spindle fibers connect during chromosome separation. It plays no role in the actin-driven division of the cytoplasm.
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.
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