Extended Response

A single layer of smooth muscle encircles the walls of blood vessels. The walls of the stomach and small intestine have a layer of circular smooth muscle and a layer of longitudinal smooth muscle.

Part A How does the muscle arrangement of blood vessels reflect the function of this structure?

Part B How does the muscle arrangement of the stomach and small intestine reflect the function of these structures?

For a question involving experimental data, determine the constants, variables, and control before answering the questions.

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