INTRODUCTION TO MUSCLES. Functions Movement Stabilization of Joints Posture Thermogenesis.

INTRODUCTION TO MUSCLES

Functions

Movement Stabilization of Joints Posture Thermogenesis

Three Types

Cardiac Muscle

Smooth Muscle

Skeletal Muscle

Cardiac Muscle

Found only in heart Involuntary Branching, striated Intercalated discs –

special cell junctions that allow heart muscles to coordinate contractions

Smooth Muscle

Mainly in walls of hollow organs Involuntary Nonstriated Peristalsis – wavelike motion of contraction

Skeletal Muscle

Voluntary – only type that makes up the “muscular system”

Found in skeletal muscles attached by tendons to bone

Striated, multinucleate

Connective Tissue Wrappings

Endomysium – wraps each muscle fiber

Perimysium – wraps bundles of fibers called fascicles

Epimysium – surrounds whole muscle

What can you identify?