The Muscular System.

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The Muscular System Chapter 7

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Presentation transcript:

The Muscular System

Muscle Tissue Blood Vessels Nerve Cells Connective Tissue Ligaments Components Muscle Tissue Blood Vessels Nerve Cells Connective Tissue Ligaments

Functions Maintains body temperature Maintains body posture Supports organs in proper position. Provides movement for the body, blood, and food Guards body openings. i.e. the sphincter muscle guards the entrance / exit into the digestive tract. 6. Supports Joints.

Types of Muscle Cells Cardiac Muscle = Makes up the heart. Skeletal Muscle = Attached to bone by tendons 3. Smooth Muscle = Lines hollow organs.

Cardiac Muscle •Are Striated • Are Involuntary • Contain Intercalcated Discs • Contain Only One Nucleus • Contract Without Direct Stimulation From Nervous System. (Heart can still beat if spinal cord is severed.)

Smooth Muscle • No Striations • Are Involuntary • Contain Only One Nucleus • Are Tapered at Each End • Also Called Visceral Muscle

Skeletal Muscle • Are Striated • Contain SEVERAL Nuclei • Are Voluntary • Controlled by the Central Nervous System • Range in Length From 1mm. to 60cm. • Muscle Cells Also Called Muscle Fibers or Striated Muscle.

B. Anatomy of Skeletal Muscles - Gross Anatomy

Sarcomere – The contracting part of the fiber