Human Anatomy and Physiology

3. Structure of myofiber

Structure of myofiber: These are the indivisual cells of muscle which are covered by endomysium and they are multinucleated. The plasma membrane is called sarcolemma. The cytoplasm is called sarcoplasm Each muscle fiber contains 1000s of cylindrical structures known as myofibrils which are contractile elements of cell. In between these myofibrils mitochondrias are seen . …

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2. Types of skeletal muscle

Functions of skeletal muscles:• Body movement(locomotion)• Maintenance of body posture• Respiration (diaphragm and intercostals muscle contraction)• Communication (verbal or facial)• Production of heat (thermogenesis)Types of body movementAdduction- moving a body part towards midlineAbduction- moving a body part away from midlineFlexion- bending a joint to decease the angle between bonesExtension- stretching a joint to increase the …

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2. MUSCLE OF THORAX AND UPPER LIMB

Muscle of thorax and upper limb• The thoracic wall is made up of five muscles: the external intercostal muscles, internal intercostal muscles, innermost intercostal muscles, subcostalis, and transversus thoracis.• These muscles are primarily responsible for changing the volume of the thoracic cavity during respiration.• Other muscles that do not make up the thoracic wall, but …

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