Actin, myosin, and troponin are: A) ligaments
B) tendons
C) muscle protein
D) bones
E) types of ligaments

The connective tissue holding bone to bone is a;
A) tendon
B) muscle
C) smooth muscle
D) ligament
E) A and D

1. C: muscle protein

2. D: ligament

1. Actin and myosin are proteins that form contractile filaments of muscle cells.  Troponin regulates muscular contraction and is found in skeletal and cardiac muscle fibers.

2. Tendons connect muscle to bone.  Muscles provide movement.  Smooth muscles behave involuntarily.  Ligaments connect bone to bone.

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