Muscular System. Functions of Muscle Tissue Produce Movement.

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Presentation transcript:

Muscular System

Functions of Muscle Tissue Produce Movement

Functions of Muscle Tissue Maintains Posture & Body Position

Functions of Muscle Tissue Supports Soft Tissues

Functions of Muscle Tissue Guards Entrances and Exits Swallowing Urinating Defecating

Functions of Muscle Tissue Maintains Body Temperature

3 Types of Muscle Tissue SkeletalSmoothCardiac

Skeletal Muscle:Structure

Skeletal Muscle: Function Voluntary movement and locomotion Facial expressions

Skeletal Muscle: Location

Cardiac Muscle: Structure

Cardiac Muscle: Function

Cardiac Muscle Location

Smooth Muscle: Structure

Cross-section of intestines showing longitudinal and circular layers Figure 10.12b

Smooth Muscle Function

Smooth Muscle: Location

Structure of a Skeletal Muscle Muscle Muscle Fascicles Muscle Fibers (Cells)

Structure of a Skeletal Muscle Fiber (Cell) Myofibrils

Structure of a Sarcomere Sarcomeres: Thick and Thin Filaments

Structure of a Skeletal Muscle Fiber (Cell) Figure 10.4b

Structure of a Skeletal Muscle Fiber (Cell) Figure 10.8

Summary of Structure of Skeletal Muscles Muscle Fasicles Muscle Fiber (Cell) Myofibril Sarcomere Myofilaments

Neuromuscular Junctions Figure 10.4d

Neuromuscular Junctions Figure 10.4d

Neuromuscular Junctions Figure 10.4d

Contraction of a Skeletal Muscle (Sliding Filament Theory) Figure 10.6a

Contraction of a Skeletal Muscle (Sliding Filament Theory)

Summary of Sliding Filament Mechanism Figure 10.6a

Muscle Attachments Most skeletal muscles run from one bone to another. Most muscles are attached to bones by tendons or aponeuroses

Muscle Attachments Origin = Point of attachment of a muscle that is least movable Insertion = point of attachment of a muscle that is most movable

Muscle Attachments: Connective Tissues Tendons Aponeuroses

Interactions of Skeletal Muscles in the Body Muscles can exert a pull but not a push. Thus, muscles are typically arranged in pairs: one pulls a bone in one direction and the other pulls it in the opposite direction.

Interactions of Skeletal Muscles Prime mover (agonist) – has major responsibility for a certain movement Antagonist – opposes or reverses a movement Synergist – helps the prime mover

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