Interactions of Skeletal Muscles in the Body Stephanie Gonzalez Period 3

Overview Prime mover (agonist)-The muscle that has the major responsibility for causing a particular movement Antagonists-Muscles that oppose or reverse a movement

AGONIST (Prime Mover) ANTAGONIST Biceps Triceps Deltoids Latissimus Dorsi Pectoralis Major Trapezius/Rhomboids Iliopsoas Gluteus Maximus Quadriceps Hamstrings

Biceps and triceps Arm muscles In this picture we can see how the when the biceps are the prime mover then the triceps are the antagonist and when the triceps are the prime movers then the triceps are the antagonist.

Latissimus Doris and Deltoids Back and shoulder muscle When the deltoid acts as the prime mover then the latissimus dorsi acts as the antagonist. However when the latissimus dorsi acts as the prime mover then the deltoid acts as the antagonist.

Pectoralis major and Trapezius Chest and lower neck muscle When the pectoralis major is the prime mover then the trapezius is the antagonist. However when the trapezius acts as the prime mover then the pectoralis major acts as the antagonist.

Iliopsoas and gluteus maximus Butt muscle When the iliopsoas acts as the prime mover then the gluteus maximus acts as the antagonist. However when the gluteus maximus acts as the prime mover then the iliopsoas acts as the antagonist

Quadriceps and hamstrings When the quadriceps are acting as the prime movers then the hamstrings are the antagonist. However, when the hamstrings are acting as the prime movers then the quadriceps are acting as the antagonist.

Synergist: is the muscle or group of muscles that stabilizes a joint around which the movement is occurring. How does it stabilize? Adding extra force to a movement Reduce undesirable or unnecessary movement as prime mover contracts

Fixator: is the muscle or group of muscles that stabilizes the origin of the primary muscle movement and the joint from which it originates, says PT Direct. Video muscle

Bibliography "Muscle Roles and Contraction Types." Ptdirect. N.p., n.d. Web. "MUSCLES AND MOVEMENT." MUSCLES AND MOVEMENT. N.p., n.d. Web. 14 Dec. 2016. "What Are Fixators and Synergists?" Reference. N.p., n.d. Web. 14 Dec. 2016.

Question #1 The muscle that has the major responsibility for causing a particular movement is called a…. Prime mover Antagonist Synergist Fixator

Question #2 2. Muscles that oppose or reverse a movement are called… Prime mover Antagonist Synergist Fixator

Question #3 3. What is the group of muscles that stabilizes a joint called? Prime mover Antagonist Synergist Fixator