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 C
Explanation
A. acetyl CoA:Acetyl CoA is a critical intermediate in cellular respiration that enters the Krebs cycle. However, it is not the primary fuel source but rather a product derived from the breakdown of carbohydrates, fats, or proteins.
B. protein:Proteins can be used for energy when carbohydrates and fats are scarce, but they are primarily reserved for structural and functional roles such as enzyme production and tissue repair. Their breakdown for energy is less efficient and not the main source of fuel.
C. glucose:Glucose is the body’s preferred and most readily available fuel for cellular respiration. It undergoes glycolysis, the Krebs cycle, and oxidative phosphorylation to produce ATP efficiently, making it the main energy substrate under normal conditions.
D. fat:Fats provide a large energy reserve and yield more ATP per molecule than glucose, but they must undergo beta-oxidation before entering respiration pathways. They are slower to mobilize and not considered the immediate source of fuel.
Correct Answer is A
Explanation
True:Vellus hair is soft, fine, and lightly pigmented, covering much of the body surface. It is most noticeable in children and adult females, where it serves a protective function without providing significant insulation.
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