1. Yenesis Alvarez Period 5
Muscle Function
Yenesis Alvarez
Period 5

2. Skeletal Muscles Also known as striated muscle
Attach to skeleton by tendons
Under voluntary control
40% of body weight

3. Functions 4 main roles in the body: Producing movement
Maintaining posture
Stabilizing joints
Generating heat

4. Movement All movements are a result of muscle contraction
Skeletal muscles: accountable for locomotion and manipulation
Allows the quick response to changes in external environment
Allow for emotional expressions

5. Maintain Posture
Main objective: Maintain seated posture despite never ending pull of gravity
Skeletal muscles function continuously in order to make this possible

6. Maintain Posture Reduces stress and strain on your spine
Allows work to be more efficient
Easier to breathe
Improves circulation and digestion
Prevents muscle fatigue and muscular pain

7. Stabilizing Joints Joint stability: Skeletal muscles:
Refers to why some joints are easier to be dislocated and have injuries than others
Depends on 3 factors:
Shape, size, and arrangement of articular surfaces
Ligaments
Tone of the muscles around joint
Skeletal muscles:
Pull on bones to cause movement
Stabilize joints

8. Stabilizing Joints Muscle tendons are essential in stabilizing joints
Tendons pull on the bone
The tighter the ligaments, the more stable the joint is

9. Generating Heat By-product of muscle activity
Muscle contraction is powered by ATP
75% of that energy escapes as heat
Heat released is responsible for maintaining normal body temperature
Skeletal muscle: muscle type most responsible for heat generation

10. Review
4 functions of muscles: movement, posture, joint stability, generates heat
Main muscle involved: skeletal muscle
Movement causes by muscle contraction
Benefits of posture: better breathing, better circulation and digestion, avoids muscle fatigue
Joint stability: deals with avoiding injury and dislocation
Heat generator: Powered by ATP

11. Question #1
Which of the following is NOT one of the functions of muscles?
Maintaining posture
Generation of heat
Pump blood throughout the body
Stabilizing joints

12. Question #2 What allows for muscles to generate heat?
ATP powers muscle contraction, releasing energy of which most of is composed of heat
The friction between the tendons allows for heat to be produced
When bones are fused together, heat is produced
Muscles naturally produce heat without any further work or adjustment

13. Question #3 How do skeletal muscles manage to stabilize joints?
By producing ATP
By pulling on bones to cause movement
Skeletal muscles do not stabilize joints
By maintaining an upright posture

14. Bibliography