What are the three main components of connective tissue?
collagen, elastin, and reticular fibers
ground substance, fibers, and cells
alveoli, fibrous capsule, and secretory cells
fibroblasts, chondroblasts, and osteoblasts
The Correct Answer is B
A. collagen, elastin, and reticular fibers: These are the main types of fibers found in connective tissue, providing strength, elasticity, and support, but they do not represent all three main components.
B. ground substance, fibers, and cells: Connective tissue is composed of cells (such as fibroblasts, macrophages, and adipocytes), fibers (collagen, elastin, reticular), and ground substance (a gel-like material that fills the extracellular space). These three components work together to provide support, strength, and a medium for nutrient and waste exchange.
C. alveoli, fibrous capsule, and secretory cells: These structures are specific to glands or organs like the lungs, not general components of connective tissue.
D. fibroblasts, chondroblasts, and osteoblasts: These are specific types of connective tissue cells responsible for producing matrix in different connective tissues, but they do not account for fibers and ground substance, so they are not the three main components
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer:Keratinocytes take up melanin granules produced by melanocytes and position them above the nucleus. This arrangement shields nuclear DNA from harmful UV radiation, reducing the risk of mutations and cellular damage.
B. provide the melanocyte with nutrients necessary for melanin synthesis:Nutrients for melanocyte function are delivered through blood supply in the dermis rather than directly by keratinocytes. Keratinocytes do not supply essential substrates for melanin production.
C. maintain the appropriate pH in order for the melanocyte to synthesize melanin granules:pH balance in the skin is regulated mainly by sweat and sebaceous secretions. Keratinocytes do not directly control melanocyte pH for melanin synthesis.
D. maintain the appropriate temperature so the product of the melanocyte will not denature:Temperature regulation is largely a function of dermal blood flow and sweat glands. Keratinocytes do not control melanocyte temperature or prevent denaturation of melanin.
Correct Answer is C
Explanation
A. cytoplasm; 2:The cytoplasm is where glycolysis occurs, producing 2 ATP molecules per glucose. The citric acid cycle does not take place in the cytoplasm.
B. cytoplasm; 30:The citric acid cycle does not occur in the cytoplasm, and it does not directly produce 30 ATP; this higher yield comes from combined cellular respiration including the electron transport chain.
C. mitochondria; 2:The citric acid cycle occurs in the mitochondrial matrix. Each turn of the cycle produces 1 ATP (or GTP) per acetyl-CoA; since one glucose yields 2 acetyl-CoA, a total of 2 ATP are produced directly by the citric acid cycle.
D. mitochondria; 28:While the citric acid cycle generates high-energy electron carriers (NADH and FADH₂) that lead to ATP production in the electron transport chain, the cycle itself directly produces only 2 ATP per glucose molecule.
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