muscles ppt in hindi mai
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4. Introduction (continued)Skeletal muscles provide strength ( production ofmuscle tension) and protection for theskeleton, enable bones to move, provide themaintenance of body posture against gravitySkeletal muscles perform both dynamic and staticwork Dynamic: locomotion & positioning of segments Static: maintains body posture
5. • Definition: Skeletal muscles are voluntary muscles which are attached to the bones of the skeleton (appendicular and axial), forming the muscles of limbs, abdomen, head, neck, face, eye, diaphragm and tongue. The number of skeletal muscles in the human body is about 640 muscles
6. Types of musclesThere are three types of muscles:1- Cardiac (in the heart).2- Skeletal (around the skeleton).3- Smooth (in the viscera).
7. Structure of Skeletal Muscle • Structural unit of skeletal muscle is the multinucleated muscle cell or fiber. Muscle fibers consist of myofibrils (sarcomeres in series: basic contractile unit of muscle). Myofibrils consist of myofilaments (actin and myosin).
8. Microscopic-MacroscopicStructure of SkeletalMuscle
9. Microscopic-MacroscopicStructure of SkeletalMuscle
10. Structure of Skeletal Muscle Composition of sarcomere 1. Z line to Z line. 2. Thin filaments (Actin) 3. Thick filaments (Myosin) 4. Myofilaments in parallel with sarcomere 5. Sarcomeres in series within myofibrils
11. The Sliding Filament Model ofMuscle Contraction
12. Functions of skeletal muscles 1. They produce tension. 2. They are responsible for body movement. 3. They provide power either to mobilize bones or to stabilize them so, skeletal muscle can be considered as "force generator system ". 4. They maintain posture.
13. Properties of skeletal muscles1 - Irritability: It is the ability of the muscle to respond to stimulus either mechanical, electrical, or thermal.2- Contractility and relaxation: It is the capacity of the muscle to develop tension between its ends "in contraction" and can release its tension "in relaxation".3- Distensibility: It is the ability of the muscle to be lengthened or stretched when an outside force is applied to it up to certain limit (physiological limit). N.B. The muscle does not suffer from stretch so long as it is not stretched beyond its physiological limits.4- Elasticity: It is the ability of the muscle to recoil to its original length when an outside force is released or removed. The muscle is still elastic unless it has been overstretched and it will recoil from a distended length.
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