Paul Andersen discusses the specifics of phylogenetics. The evolutionary relationships of organisms are discovered through both morphological and molecular data. A specific type of phylogenetic tree, the cladogram, is also covered.

A substance in which the concentration of oxygen is elevated is said to be oxygenated.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

A substance that has had oxygen removed from it in some way.
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br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...

What is it in our blood that makes it red, and why are other animals different? Biology - Human Body - Learning Points. Haemoglobin is the most efficient oxygen carrier and provides the red pigment in blood. Not all animals have red...

We dissect and examine a cow\u2019s heart to show the position and function of different parts. This includes the coronary artery, ventricles, atria, pericardium and the thickness of the muscle tissue. Biology - Human Body - Learning...

In this video, we explore the basic anatomy of the heart's chambers, valves, and great vessels; and, we track the flow of blood through the chambers, valves, and major vessels (systemic and pulmonary circulation).

In this video, we cover the parts and purpose of pulmonary circulation as it relates to the respiratory system.<br/>

The circulatory system works to transport oxygen and nutrients to cells in your body, while removing waste products (such as carbon dioxide) at the same time. This system is actually a double circulatory system, made of two circuits -...

How to build your own working model of the heart (cardiovascular system)