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 A
Explanation
A. Fibrocartilage; hyaline cartilage:Fibrocartilage is found in intervertebral discs, providing strong support and resistance to compression due to its dense collagen fibers. Hyaline cartilage forms the costal cartilage between ribs and the sternum, offering flexibility and smooth surfaces for joint movement.
B. Dense regular CT; fibrocartilage:Dense regular connective tissue is found in tendons and ligaments, not in intervertebral discs. Fibrocartilage, while present in discs, is not the main component of costal cartilage.
C. Hyaline cartilage; fibrocartilage:Hyaline cartilage provides structural support and smooth surfaces, but it is not the primary tissue of intervertebral discs. Fibrocartilage is not the main tissue of costal cartilage.
D. Fibrocartilage; dense regular CT:Dense regular connective tissue does not make up costal cartilage; it is primarily in tendons and ligaments. Fibrocartilage correctly describes intervertebral discs.
E. Elastic cartilage; hyaline cartilage:Elastic cartilage is found in structures requiring flexibility, such as the ear and epiglottis, not intervertebral discs. Hyaline cartilage correctly describes costal cartilage, but the first part is inaccurate.
Correct Answer is A
Explanation
A. within the cartilage divide and secrete new matrix:Chondroblasts are immature cartilage cells responsible for producing and secreting the extracellular matrix, including collagen and proteoglycans. They actively divide and contribute to cartilage growth, especially at the periphery (appositional growth).
B. remain in compact bone even after the epiphyseal plate closes:This description more closely matches osteocytes in bone, not chondroblasts. Chondroblasts are specific to cartilage and do not persist in compact bone after growth plates close.
C. are mature cartilage cells located in spaces called lacunae:This describes chondrocytes, the mature form of cartilage cells that reside in lacunae and maintain the matrix, rather than actively secreting it like chondroblasts.
D. never lose their ability to divide:Chondroblasts can divide while immature, but once they mature into chondrocytes, their division is very limited. Therefore, they do lose much of their proliferative capacity after maturation.
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