An-Najah National University Faculty of Medicine Department of Physiology Anatomy and Physiology 1 7102101 Instructor: Heba Salah Chapter 4: The Muscular.

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An-Najah National University Faculty of Medicine Department of Physiology Anatomy and Physiology Instructor: Heba Salah Chapter 4: The Muscular System Part 2: Anatomy, and Activity of Skeletal Muscle Tissue

Microscopic Anatomy of Skeletal Muscle

Skeletal Muscle Activity Properties of Skeletal Muscle Activity (single cells or fibers) 1.Irritability – ability to receive and respond to a stimulus 2.Contractility – ability to shorten when an adequate stimulus is received

Motor Unit

The Neuromuscular Junction

Transmission of Nerve Impulse to Muscle

The Sliding Filament Theory of Muscle Contraction Activation by nerve causes myosin heads (crossbridges) to attach to binding sites on the thin filament Myosin heads then bind to the next site of the thin filament This continued action causes a sliding of the myosin along the actin The result is that the muscle is shortened (contracted)

The Sliding Filament Theory

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