system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Diapedesis primarily occurs in?
assistant
The correct answer is  Ans is 'b' i.e. Venules o Diapedesis is the process of transmigration of leukocytes across the endotheliumo Leukocyte diapedesis, similar to increased vascular permeability, occurs predominantly in the venules (except in lungs, where it occurs in capillaries).