Sophia Learning
Sophia: Animals: Human Respiratory System: Lesson 3
This lesson provides an overview that explains the respiratory system in humans. It is 3 of 5 in the series titled "Animals: Human Respiratory System."
Merriam-Webster
Merriam Webster: Dictionary Illustration: Respiratory System
Simple labeled diagram of the parts of the human respiratory system.
University of Minnesota
University of Minnesota: Anatomy Image Bank
Hundreds of anatomy diagrams for classroom or medical use. Each image represented is a simple black-and-white professional drawing of a specific part of the human body.
University of Utah
University of Utah: Cardiovascular Pathology Index
This site features a detailed index of photographs for cardiovascular pathology. You can see what a normal human heart looks like and what a sick one looks like too. Come and check it out.