Question

which of the following is not a proteoglycan found in the matrix of connective tissue? glucosamine collagen hyaluronic acid all of the above are proteoglycans. question 17 1 pts which tissue is most likely to form a keloid scar as it heals? muscle nervous epithelial connective question 18 1 pts which cells form the blood - brain barrier that protects the brain from harmful substances in the blood? oligodendrocytes neurons astrocytes microglia

Explanation:

• For the first question, collagen is a fibrous protein, not a proteoglycan. Proteoglycans are large molecules composed of a core - protein with attached glycosaminoglycan chains, and glucosamine is a component of glycosaminoglycans and hyaluronic acid is a glycosaminoglycan.
• For the second question, connective tissue is most likely to form a keloid scar during healing due to its high collagen - producing capacity.
• For the third question, astrocytes play a key role in the formation and maintenance of the blood - brain barrier, interacting with endothelial cells of brain capillaries.

Answer:

• Question 1: B. Collagen
• Question 17: D. Connective
• Question 18: C. Astrocytes