For a class of 30 students. Using preserved pig hearts, preserved sheep hearts, and a preserved cow heart, students compare and contrast the internal and external structure of the hearts from these 3 species of mammals and explore the possible reasons for differences among them. Includes 6 pig hearts, 6 sheep hearts, and 1 cow heart to be used for extension activities and as a demonstration model. Also includes The Heart poster, from The Johns Hopkins Human Anatomy Series, a set of 4 prepared slides showing cardiac muscle and blood vessels, and a detailed teacher's manual containing background information, dissection procedures, and extension activities for exploring the structure and function of mammalian hearts.

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