Which blood component plays a crucial role in maintaining blood vessel integrity by regulating vascular tone and preventing excessive bleeding?

A Platelets
B Neutrophils
C Eosinophils
D Endothelial cells ✓

Explanation

Endothelial cells line blood vessels and play a key role in maintaining vascular tone, preventing excessive bleeding, and regulating immune responses.

Source

Robbins and Cotran Pathologic Basis of Disease
Hematology Hematology: Blood Components Hematology: Blood Components Hard MEDICAL Confidence: high