1. 8.7 Objective: Vocabulary:
Unit 2: Support & Movement
8.7
Aim: How do the bones and muscles work together to move?
AGENDA
Introduction
Mini-Lesson
Summary
Work Period
Exit Slip
Do Now
Objective:
I will describe the anatomy and physiology of skeletal muscle movements.
Vocabulary:
Origin, insertion, prime mover, agonist, synergist, antagonist, fixator, flexion, extension

2. Bending or straightening of elbow requires the coordinated interplay of the biceps and triceps muscles

3. Muscle Teamwork
Muscles usually work in pairs or groups to move our bones. This occurs at MOVABLE JOINTS. (hips, elbow, shoulder, knee, etc…).
When a muscle contracts, usually just ONE bone moves. The other is STATIONARY.
 The ORIGIN is where the muscle joins the stationary bone.
The INSERTION is where it joins the moving bone.
When a muscle contracts, the insertion moves
TOWARD the origin.

4. Muscle Teamwork
Agonist (PRIME MOVER):
- the muscle or group of muscles producing a desired effect
Antagonist:
- the muscle or group of muscles OPPOSING the action
Synergist:
- the muscles surrounding the joint being moved
Origin:
- IMMOVABLE end of the muscle
Insertion:
- MOVABLE end of the muscle
Fixators:
- the muscle or group of muscles that steady joints. Sometimes called STABILIZERS.
Flexion: the SHORTENING of a muscle
Extension: the LENGTHENING of a muscle

5. Muscle Action Diagram