It could be classified at the synthesis level of Bloom's cognitive hierarchy of learning. Students use their knowledge of the human heart and create a new heart with slight variations in anatomical structure. Students are given a story about an alien nation who suffer from hearts which fail early in their lives. The students are asked to design an artificial heart which will help the aliens extend their life expectancy.
Students can make their artificial hearts use an array of materials.
Finally the students need some materials to build their artificial heart. I definitely recommend Play Doh in an array of color. It is important to remind your students not to mix the Play Doh unless you want your Play Doh to resemble a Greatful Dead T-shirt. Aside from the Play Doh I use what ever I can find to represent other structures of the heart like pipe cleaners or wicke sticks to represent arteries or veins. Assignment I give this assignment to students at the end of a heart unit because it allows the students to use their currents knowledge of the heart and apply it to a new situation.