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
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Related Questions
Correct Answer is C
Explanation
A. sebaceous:Sebaceous glands are exocrine glands that release sebum into hair follicles or onto the skin surface through ducts. They are not involved in direct secretion into the bloodstream.
B. exocrine:Exocrine glands secrete their products through ducts onto epithelial surfaces, such as sweat or salivary glands. They differ from endocrine glands, which release secretions directly into the blood.
C. endocrine:Endocrine glands, including the thyroid, pituitary, and adrenal glands, secrete hormones directly into the bloodstream. These hormones regulate numerous physiological processes throughout the body.
D. ceruminous:Ceruminous glands are specialized exocrine glands in the ear canal that secrete cerumen (earwax). They release their product via ducts, not into the blood.
Correct Answer is A
Explanation
A. glucose is formed from noncarbohydrate molecules:Gluconeogenesis is the metabolic process in which glucose is synthesized from noncarbohydrate precursors such as amino acids, lactate, and glycerol. This process primarily occurs in the liver and helps maintain blood glucose levels during fasting or intense exercise.
B. glycogen is formed:The formation of glycogen from glucose is called glycogenesis, not gluconeogenesis. Glycogenesis stores glucose for later use rather than producing it from noncarbohydrate sources.
C. glucose is converted into carbon dioxide and water:The breakdown of glucose into carbon dioxide and water occurs during cellular respiration, specifically glycolysis, the Krebs cycle, and oxidative phosphorylation, not gluconeogenesis.
D. glycogen is broken down to release glucose:The breakdown of glycogen to release glucose is called glycogenolysis. This process provides glucose when energy is needed but does not involve the formation of glucose from noncarbohydrate sources.
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