Which epithelial tissue lines blood vessels and heart?
Go with B — Endothelium. Within Tissue-I, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, location matters here: Endothelium is the structure or site that matches the description. Holding that picture in mind makes Endothelium feel natural rather than something you only memorise. Link the term to a real body example (organ, tissue, or ion flow) so the idea stays concrete under exam pressure. A short mental diagram helps — start from stimulus or structure, follow the pathway, and stop at the functional result described by Endothelium. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.