Muscle Tissue Flashcards
Cardiac muscle
Heart
Striated and involuntary
Intercalated disks
Smooth muscle
Digestive system
Blood vessels
Non striated
Involuntary
Functions of skeletal muscle
Movement
Posture and position
Support soft tissues (abdominal wall and floor of pelvis cavity)
Guard entrances and exits ( usually sphincter muscles)
Heat
Store nutrient reserves (glycogen)
3 layers of skeletal muscle
Epimysium
Perimysium
Endomysium
Epimysium
Outer layer
Separates muscle from surrounding tissues
Consist of sense layer of collagen fibers connected to the deep fascia
Perimysium
Diviides muscle into compartments of muscle fibers (fascicles)
Possess collagen and elastic fibers as well as blood vessels
Endomysium
Surrounds each much fiber
Connects fibers
Contains capillary networks , myosatallite cells and nerve fibers
Aponeurosis
Sheet of connective tissue that connects muscles
Myosatallite cells
Fixer cells
Tendons
Attach muscle to bone and aponeurosis attach muscle to muscle
Another name for muscle cells
Muscle fibers
Sarcolemma
Cell membrane of muscle cells
Sarcoplasm
Cytoplasm of a muscle cell
Myo fibril
Cylinder that runs the length of the muscle fiber
Actin
Thin protein filament needed to perform a muscle contraction
Myosin
Thick filaments
Needed for muscle contraction
Sarcoplasmic reticulum
Forms a tubular network around each myofibril
Cisternae
Expanded chambers of sr
Contain high concentrations of calcium ions
Sarcomere
Smallest fictional unit of the muscle fiber
Sliding filaments
During contraction the actin slide toward the center of the Sarcomere along the myosin
Myosin heads bind to active site on actin
Cross bridge formed pivots toward the center of Sarcomere pulling the whole thin filament with it
What are the types of muscle tissue?
Cardiac muscle
Smooth muscle
Skeletal muscle
