1. All muscles come in pairs, the agonist and the ________________. a. Abductor b. Bipennate c. Sacromere d. Antagonist Antagonist is the correct answer. The antagonist works to counter the torque of the agonist, often used in slowing down a motion. Occurring in pairs, the agonist and the antagonist often balance each other, one contracts and the other relaxes. Abductor is a movement away from the midline. Bipennate is a type of muscle fiber, where two rows of opposite diagonal fibers come together at a single tendon creating more strength but less shortening. Sarcomere is the smallest and most basic building block of a muscle fiber. 2. The long shaft of a bone is called ____________________. a. Epiphysis b. Endosteum c. Diaphysis d. Periosteum Diaphysis is the correct answer. Epiphysis is the end of a long one. Endosteum is the thin layer of connective tissue which makes up the medullary cavity. Periosteum is a sheath of connective tissue enveloping the bone except at articulation. 3. Where bones meet to form a joint. a. Ligament b. Enthesis c. Bursa d. Articulation Articulation is the correct answer. It is where two bones meet to form a joint. A ligament is connective tissue that attaches bone to bone. Enthesis is connective tissue between a ligament and