Question

Read the following statements and choose the correct answer.
i.Gap junctions cement adjacent cells together
ii. Areolar tissue contains fibroblasts, macrophages and mast cells
iii. Tight junctions facilitate the cells to communicate with each other
iv. Adhering junctions help to stop substances from leaking across tissues
v. Cells of connective tissue except blood secrete fibres of structural proteins called elastin

• A. i, ii and iii only are wrong
• B. i, iii and iv only are wrong
• C. iii and v only are wrong
• D. i, ii and v only are wrong
• E. ii, iv and v only are wrong

Answer 1

Answer: (B)

Gap junctions are direct cytoplasm to cytoplasm connection between many kind of animal cells by protein pipes called connexons. They permit transport of ions and small molecules between cells without leaking into the space or gap between them. Tight junctions are regions where membranes of adjacent animal cells are held close together by sealing strands. They tie the cells firmly and check the movement of materials and thus communication between them. Adhering junctions form a strengthening and interlocking belt encircling the exterior of adjacent cells and contribute to the stability and integrity of the cell layer.