Describe in detail the histological and structural unit of the liver?

Please answer each question in detail and picture is required and references.
I need high quality of work, AND remember this is a Histology paper so please make sure you include histology. Like description of the cell, nucleus, staining etc. please make sure everything’s clear and you knew what your writing about.
It has to be 4 pages long.
1: Describe in detail the histological and structural unit of the liver?
2: Describe the histological cells of the exocrine portion of the pancreas? What role do they play in digestion?