1. Muscles action and groupings
A review of ideas

2. Muscle Definition
Muscle tissues can contract They operate by muscle fibers shortening There are 3 types of muscle Tissue:
1. Skeletal Muscle Tissue
2. Smooth Muscle Tissue
3. Cardiac Muscle Tissue

3. Skeletal Muscle Tissue
Found in skeletal muscles
Used in movement of bones at joints
Helps maintain posture
Has striations
Many Nuclei
Voluntarily Controlled
Well-developed transverse tubule system
Contracts and relaxes rapidly

4. Smooth Muscle Tissue Found in walls of hollow viscera
Used in movement of viscera and peristalsis
NO striations
Single Nucleus
Lacks transverse tubules
Involuntarily controlled
Contracts and relaxes slowly

5. Cardiac Muscle Tissue Found only in walls of heart
Used in pumping action of the heart into blood vessels and heart chambers
Has striations
Single nucleus
Has intercalated disks shown in picture
Fibers branch off one another
Involuntarily controlled

10. This is what a relaxed muscle looks like…..
And this is what a contracted muscle looks like.

11. Muscle Groupings