Histology Guide

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Chapter 17 - Respiratory System

The respiratory system is responsible for taking in oxygen and expelling carbon dioxide. It can be divided functionally into two regions:


The adult lungs are sponge-like organs. The main function of the lungs is to provide oxygen and remove carbon dioxide from blood.

Respiratory Epithelium

Respiratory epithelium is a pseudostratified ciliated columnar epithelium with goblet cells that covers most regions of the conducting portion.