Objective: The student will examine the role that heart muscle may have in creating small machines used for space travel efforts.

1	These muscle powered machines being researched have applications on board NASA spacecraft for all of the following EXCEPT:
	A)	replacement of muscle cells that atrophy in zero gravity
	B)	repair
	C)	exploration
	D)	build things as needed
2	What type of cells were used in this study?
	A)	rat heart cells
	B)	monkey nerve cells
	C)	rabbit retinal cells
	D)	mice bone cells
3	Why were these cells specifically chosen?
	A)	they are able to spontaneously contract
	B)	they are easy to grow
	C)	they are not sensitive to gravitational pulls
	D)	they are easy to obtain
4	Fuel of the muscle cells?
	A)	Liquid oxygen
	B)	Amino acids
	C)	Calcium
	D)	Sugar