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. squamous cell carcinoma
This cancer arises from the keratinocytes of the stratum spinosum, often due to UV damage, and can metastasize if not treated early.
B. melanoma
Melanoma arises from melanocytes, which are found in the stratum basale, not the stratum spinosum.
C. basal cell carcinoma
This cancer originates from basal cells of the stratum basale, the deepest layer of the epidermis.
Correct Answer is C
Explanation
A. he could develop brittle bones
Brittle bones are more associated with osteoporosis or osteogenesis imperfecta, not primarily from vitamin D deficiency due to lack of sunlight.
B. he could develop very dense bones
Dense bones are seen in conditions like osteopetrosis, which results from defective osteoclast activity-not lack of sunlight.
C. he could develop soft, bowed bones
Lack of sunlight leads to vitamin D deficiency, impairing calcium absorption, which causes rickets in children and osteomalacia in adults, both of which involve soft, weakened bones that may bow under body weight.
D. he could develop nightmares
While isolation might impact mental health, this has no direct link to skeletal effects or bone physiology.
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