The shape of the external ear is maintained by
fibrocartilage CT
elastic cartilage CT
adipose tissue CT
hyaline cartilage CT
The Correct Answer is B
A. fibrocartilage CT: Fibrocartilage provides strong support and shock absorption in areas such as intervertebral discs and the pubic symphysis, but it is too rigid to maintain the flexible shape of the external ear.
B. elastic cartilage CT: Elastic cartilage contains a dense network of elastic fibers that provide both strength and flexibility. This allows the external ear (pinna) to maintain its shape while remaining pliable.
C. adipose tissue CT: Adipose tissue stores fat and cushions structures but does not provide the structural framework necessary to maintain the shape of the ear.
D. hyaline cartilage CT: Hyaline cartilage is found in structures such as the trachea and nose, providing support with limited flexibility. It is not elastic enough to preserve the shape of the external ear.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Electron transport chain/oxidative phosphorylation:This stage of cellular respiration produces the majority of ATP, typically about 26–34 molecules per glucose. It relies on the transfer of electrons through protein complexes and the use of a proton gradient to drive ATP synthase activity.
B. oxidation reactions:Oxidation reactions remove electrons from molecules, often transferring them to NAD⁺ or FAD. While essential for energy extraction, these reactions alone do not directly generate large amounts of ATP.
C. substrate-level phosphorylation:This mechanism occurs during glycolysis and the Krebs cycle, producing ATP directly from enzyme-mediated reactions. However, it only accounts for a small fraction of ATP yield, about 2 ATP in glycolysis and 2 in the Krebs cycle.
D. lactic acid production:Lactic acid is formed in anaerobic respiration when pyruvate is reduced to lactate. This process regenerates NAD⁺ for glycolysis but yields no additional ATP beyond the small amount produced in glycolysis itself.
Correct Answer is A
Explanation
A. axillary and pubic areas:Apocrine glands are concentrated in the axillae, areolae, and pubic regions. They become active during puberty and release a thicker secretion that can produce body odor when decomposed by bacteria.
B. soles of the feet:The soles contain numerous eccrine sweat glands, which function in thermoregulation, but apocrine glands are not typically found here.
C. palms of the hands:Like the soles, the palms are rich in eccrine sweat glands for cooling, but they lack apocrine glands.
D. both A and B:Apocrine glands are not present in the soles of the feet, only in axillary and pubic regions.
E. both B and C:Neither the soles nor the palms contain apocrine glands; they only have eccrine sweat glands.
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