The Length-Tension Relationship

1			In this experiment, when the muscle is stretched what happens to the length of the muscle fibers?
			A)	the muscle fibers get longer.
			B)	the muscle fibers stay the same length.
			C)	the muscle fibers get shorter.
2			If muscle fibers are composed of a series of sarcomeres laid down next to one another, what happens to the length of the sarcomeres when muscle fibers are stretched?
			A)	The sarcomeres get longer.
			B)	The sarcomeres stay the same length.
			C)	The sarcomeres get shorter.
3			Initially, you applied a shock to the shortened muscle and measured the tension. You the stretched the muscle and repeated the experiment. Did the amount of tension:
			A)	decrease as the muscle was stretched to about 28 mm?
			B)	remain constant as the muscle was stretched to about 28 mm?
			C)	increase as the muscle was stretched to about 28 mm?
4			If the amount of tension produced by the muscle depends upon the number of crossbridges, according to your data did the number of crossbridges:
			A)	decrease as the muscle was lengthened to about 28 mm?
			B)	remain constant as the muscle was lengthened to about 28 mm?
			C)	increase as the muscle was lengthened to about 28 mm?
5			According to your data, a single contraction produced maximum tension when the muscle was held at:
			A)	about 26 mm.
			B)	about 28 mm.
			C)	about 30 mm.
6			If maximum tension indicates that the thick and thin filaments are set at optimal overlap to produce a maximum number of crossbridges, further stretching of the muscle will:
			A)	increase the amount of thick and thin filament overlap.
			B)	not change the amount of thick and thin filament overlap.
			C)	decrease the amount of thick and thin filament overlap.
7			If the tension produced by a contracting muscle fiber depends upon the number of crossbridges between the thick and thin filaments, stretching the muscle beyond 28 mm:
			A)	decreases the amount of overlap and increases the amount of tension produced by a single contraction.
			B)	decreases the amount of overlap and does not change the amount of tension produced by a single contraction.
			C)	decreases the amount of overlap and decreases the amount of tension produced by a single contraction.
8			At what length do you think this muscle would be able to lift the heaviest weight?
			A)	About 26 mm.
			B)	About 27 mm.
			C)	About 28 mm.
			D)	About 29 mm.
9			In the intact frog, muscles are held close to their resting length so that maximum tension can be achieved. Excessive shortening and lengthening of the muscle is prevented by:
			A)	tendons.
			B)	ligaments.
			C)	motor neurons.
			D)	bones and joints.
10			Maximum tension is achieved when the muscle is at resting length. According to your data, the resting length of the muscle was:
			A)	about 26 mm.
			B)	about 27 mm.
			C)	about 28 mm.
			D)	about 29 mm.