Lesson 8 Homework Practice Solve Systems Of Equations Algebraically Answer Key

Lesson 8 Homework Practice Solve Systems Of Equations Algebraically Answer Key

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Because the elasticity of the surrounding tissue is essential to opening and closing a valve's cusps, the lesson material includes a practice problem in which students experiment with different materials, such as plastic, rubber or steel, as the tissue.

The lesson also includes a brief activity that introduces the topic of Young's modulus and the process of determining the modulus of a material from the slope of stress vs. strain curve. Students learn how to use a stress vs. strain curve on a plastic window to determine the Young's modulus.

Students have learned that laminar flow has a lower velocity and pressure than turbulent flow and that the presence of turbulence can cause the pulse of aortic valves to be slower than normal. They also learned about the effects of elasticity (stretchiness) of the aortic valve and that both material elasticity and muscle contraction act together to close the aortic valve. This lesson also includes the basic concepts of the different types of elastic materials, including rubber and steel, to determine which materials would be best to use for a testable model heart valve. Students also learned that in order for a valve to function properly, the elasticity of the surrounding tissue must be far greater than the elasticity of the valve. When the tissue and the valve are both the same type of material (ie, tissue is more elastic than the valve), the valve will not function properly. However, if the tissue is more elastic than the valve, the valve will open and close normally.

The lesson culminates with the students presenting their prototypes. Students are asked to describe how their model heart valves work and why it is an effective valve. They are also asked to suggest potential applications of these valve models.

This lesson is the third component of the Engineering Design Sequence, which is the Engineering Design Sequence. The Engineering Design Sequence is a progression of five engineering design lessons that teach students the process of designing a workable, functional model. Each lesson builds on the previous lesson, introducing new concepts and principles. The Engineering Design Sequence is based on the engineering design process, an iterative and progressive design methodology that includes gathering requirements, analysis, design and testing. Each successive lesson moves students through a series of engineering design stages that culminate in testing. The five lessons, and the associated activities, are as follows:

Lesson 3: Conceptual Design

Lesson 4: Design Rules

Lesson 5: Design Testing

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