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Muscle Tissue. Chapter 10. Functions. Produce movement Maintain body posture and positioning Soft tissue support Guard entrances and exits thermoregulate. Skeletal Muscle Features. Derived from myoblasts Muscle fiber is a muscle cell
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Muscle Tissue Chapter 10
Functions • Produce movement • Maintain body posture and positioning • Soft tissue support • Guard entrances and exits • thermoregulate
Skeletal Muscle Features • Derived from myoblasts • Muscle fiber is a muscle cell • Skeletal muscle fibers extend the length of the muscle • Multinucleate • Plasma membrane is called the sarcolemma • Cytosol is called the sarcoplasm • Transvers (T) Tubules transmit action potentials to interior of muscle fiber • Sarcoplasmic reticulum (smooth ER) is specialized to store Ca2+ • Connective tissue coverings
Organization of Skeletal Muscle Muscle fiber myofibril myofilament actin & myosin
Sarcomere • Contractile unit of muscle • Specialized arrangement of actin and myosin