Students walk through a timeline of the phases of respiratory development in the fetus, and then propose reasons for fetal breathing movements.

An overview of the evolution of modern mamallian circulation. This is a good site since it puts the circulation found in reptiles in perspective. Compares it to systems in fish and mammals.

Describes the parts of a pig's circulatory system and how its blood circulates. Circulation in a pig fetus is also described as it has differences.

Play this interactive hangman game to develop your vocabulary of terms dealing with the heart and circulatory system.

Describes the anatomy of a fish's circulatory system and how the blood circulates in a fish.

Describes the parts of a rat's circulatory system and how the blood circulates in a rat.

A student inquiry into properties of the ocean's carbonate buffer system, and how changes in atmospheric carbon dioxide levels may affect ocean pH and biological organisms that depend on calcification.

An extensive page on the circulatory system in general. Scroll down to section 49.3 and you will find a simple comparison of the reptilian system to the other vertebrae systems.

The creation of wind systems by Hadley cells is explained at this site.

This video segment describes the basics of the circulatory system: how the heart pumps the blood that carries oxygen and nutrients throughout the body. [3:14]

This site contains pictures of hearts that have some type of problem such as narrowing of the arteries and muscle damage from a heart attack. There is also a terrific picture of the coronary artery system that supplies the heart.

This article provides information about peripheral arterial disease and claudication (poor circulation) and related health problems it.

An activity where students take on the roles of parts of the circulatory system, and simulate the transport of nutrients, oxygen, and carbon dioxide through the blood stream.

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.

Teacher directed instructional activity where students dramatize the flow of blood through the heart.

A labeled diagram of the major veins and arteries in the human body.

Through informational text along with printable notes, animations, video clips, and practice problems, students discover how the structures of the cardiovascular and respiratory systems work together and function as one. Provides lots of...

Students investigate the properties of water in the ice and liquid phase as it relates to convection in the ocean and density driven circulation, and ultimately the climate.

A webpage discussing the global climate systems of El Nino and La Nina. Learn that these weather patterns are "ocean warming" events that are global climate fluctuations that cause major changes in the Pacific atmospheric and ocean...

See a chart of Old English Money that was in circulation in 1945.

Defines and describes the three main types of lung disease: airway diseases, lung tissue diseases, and lung circulation diseases. Also includes links to other common lung diseases that provides facts on causes, symptoms, treatment,...

A collection of resources - interactive activities and teacher tutorials - on the impact the ocean has on weather and climate.

Color-coded image of ocean currents depicts directional flow and speed of the currents across the globe.

This is the eighth lesson in a series of learning modules on the topic of climate change. It explores the role that oceans play in global climate change. Includes comprehension questions and interactive tools for understanding the...