Which of the following is a characteristic of epithelial tissue?
tightly packed cells
extensive extracellular matrix
a rich blood supply
presence of lacunae
The Correct Answer is A
A. tightly packed cells: Epithelial tissue consists of cells that are closely packed together with minimal extracellular space, forming continuous sheets that cover surfaces or line cavities. This allows for effective protection, absorption, and secretion.
B. extensive extracellular matrix: This is characteristic of connective tissue, not epithelial tissue. Epithelial tissue has very little extracellular matrix.
C. a rich blood supply: Epithelial tissues are avascular, meaning they lack a direct blood supply. They receive nutrients via diffusion from underlying connective tissue.
D. presence of lacunae: Lacunae are small spaces that contain cells in cartilage or bone tissue, not epithelial tissue.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. terminal; vellus
Terminal hairs are thick and pigmented. During puberty, hairs typically change from vellus to terminal, not the reverse.
B. lanugo; vellus
Lanugo is the fine hair present on fetuses, not typical of pre-pubertal facial hair.
C. vellus; lanugo
This is also in Lanugo is not a stage in puberty; it is lost after birth.
D. lanugo; terminal
While terminal hair is correct, lanugo is irrelevant in this pubertal context.
E. vellus; terminal
During puberty, vellus hair (fine and lightly pigmented) on the face is replaced by terminal hair (thicker, darker, and coarser) under the influence of androgens.
Correct Answer is B
Explanation
A. vitamin A
Vitamin A plays a role in bone remodeling, but excess vitamin A can cause bone fragility. It’s not the first recommendation in cases of brittle bones.
B. vitamin D
Vitamin D helps the body absorb calcium from the digestive tract. A deficiency can lead to osteomalacia (soft bones) or osteoporosis (brittle bones), and also contributes to tooth decay.
C. vitamin C
Vitamin C is needed for collagen synthesis, which is important in bone matrix formation, but deficiency leads to scurvy, not typically brittle bones and teeth loss in this context.
D. vitamin E
Vitamin E is an antioxidant but does not have a primary role in bone or dental health.
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