1. Interactions of Skeletal Muscles in the Body
Stephanie Gonzalez
Period 3

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

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

4. 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.

5. 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.

6. 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.

7. 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

8. 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.

9. 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

10. 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

11. 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
"What Are Fixators and Synergists?" Reference. N.p., n.d. Web. 14 Dec

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

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

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