Question

cell involved in making the inner walls of large blood vessel

Answer 1

The squamous epithelium (pavement epithelium) is made up of a single thin layer of flattened cells with irregular boundaries. They are found in the walls of blood vessels and air sacs of lungs and are involved in a function like forming a diffusion boundary.

Answer 2

The inner layer consists of two layers
1. elastic membrane - consists of yellow fibres
2. endothelium- consists of flattened squamous epithelial cells