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Chapter 42

Chapter 42. Circulation and Gas Exchange. Overview: Trading Places. Every organism must exchange materials with its environment Exchanges ultimately occur at the cellular level In unicellular organisms, these exchanges occur directly with the environment.

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The Hear t

The Hear t. The Heart. Heart pumps over 1 million gallons per year Over 60,000 miles of blood vessels. I. Layers of Heart Wall. Pericardium protects and anchors the heart, prevents overstretching Myocardium cardiac muscle layer is the bulk of the heart Endocardium

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Lesson 6: The Circulatory System

Lesson 6: The Circulatory System. Blood Vessels. If you could join all the blood vessels in your body in a straight line, it would be about 100,000km long! Our blood vessels are not one long tube but a complex network of tubes that branch and rebranch . Arteries & Arterioles: .

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Arteries branch - PowerPoint PPT Presentation

Chapter 42

The Hear t

Lesson 6: The Circulatory System