Al-Mustansiriya University Collage of Pharmacy

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Al-Mustansiriya University Collage of Pharmacy Histology of Muscular system and Nervous system Al-Mustansiriya University Collage of Pharmacy Lecturer Dr Samah A. Jassam BSc MSc PhD MRSB

Muscular System: Muscle Tissue The muscular system is responsible for the movement of the human body. Attached to the bones of the skeletal system are about 700 named muscles that make up roughly half of a person’s body weight. Muscle Tissue Types 1. Skeletal muscle = voluntary striated muscle 2. Cardiac muscle = involuntary striated muscle 3. Smooth muscle = involuntary non-striated muscle

Characteristics of all muscle tissues: 1. Specialized cells: elongated, high density of myofilaments = cytoplasmic filaments of actin and myosin 2. Excitability/irritability: receive and respond to stimulus 3. Contractility: shorten and produce force upon stimulation 4. Extensibility: can be stretched 5. Elasticity: recoil after stretch

Skeletal Muscle Tissue -Skeletal muscles represents 44% of body mass. A skeletal muscle = an organ: composed of skeletal muscle cells (fibers), CT, nerves and blood vessels Functions of skeletal muscles: 1. Produce skeletal movement 2. Maintain posture and upright position 3. Stabilize joints 4. Support soft tissues 5. Guard entrances and exits 6. Generate heat (maintain body temp)