Fibroblasts are the primary cells responsible for secreting collagen and elastin fibers in connective tissues.
Cartilage, Bone, Adipose tissue, and Areolar tissue: All contain fibroblasts or related cell types (chondrocytes in cartilage, osteoblasts in bone, adipocytes in adipose tissue) that produce collagen or elastin fibers.
Blood: Blood does not contain fibroblasts. Its matrix (plasma) contains various proteins, but these are not secreted by blood cells in the same way that fibroblasts secrete collagen and elastin.
| List - I | List – II | ||
| A. | Squamous Epithelium | i. | Goblet cells of alimentary canal |
| B. | Ciliated Epithelium | ii. | Inner lining of pancreatic ducts |
| C. | Glandular Epithelium | iii. | Walls of blood vessels |
| D. | Compound Epithelium | iv. | Inner surface of Fallopian tubes |
Given below are two statements:
Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.
Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.
In the light of the above statements, choose the most appropriate answer from the options given below: