1. Isometric contraction is a) when the muscle shortens during contraction
b) muscle tension increasing while the muscle length stays the same
c) when the muscle lengthens during contraction
d) fiber length changes while the tension stays the same
2. Isotonic contraction is
a) when the muscle lengthens during contraction
b) when the muscle shortens during contraction
c) fiber length changes while the tension stays the same
d) muscle tension increasing while the muscle length stays the same
3. Excitation-contraction coupling theory explains
a) when the muscle lengthens during contraction
b) how muscles contract to produce force with muscle fibers binding to create
cross bridges
c) the sequence of events through which the nerve fiber stimulates the skeletal
muscle fiber causes its contraction.
d) both b and c
4. Action potential is
a) a stimulation of the muscle in the form of an impulse
b) attached to the protein tropomyosin within the actin filaments
c) when the muscle lengthens during contraction
d) all of the above
5. What is troponin?
a) is a complex of three proteins that are integral to muscle contraction
b) attached to the protein tropomyosin within the actin filaments
c) when the muscle lengthens during contraction
d) both a and b