Question | Answer |
a sheath of areolar connective tissue that wraps around individual skeletal muscle fibers | endomysium |
dense irregular connective tissue that separates a muscle into groups of individual muscle fibers | perimysium |
bundles of muscle fibers | fascicles |
the outermost connective tissue layer that encircles an entire skeletal muscle | epimysium |
dense irregular connective tissue that lines the body wall and limbs and holds functional muscle units together | fascia |
a cord of dense regular connective tissue that attaches muscle to the periosteum of bone | tendon |
muscle cell | muscle fiber |
areolar and adipose connective tissue that separates muscle from skin | subcutaneous layer |
connective tissue elements extended as a broad, flat layer | aponeurosis |
a two-layer tube of fibrous connective tissue enclosing certain tendons | tendon (synovial) sheath |
synapse between a motor neuron and a muscle fiber | neuromuscular junction |
invaginations of the sarcolemma from the surface toward the center of the muscle fiber | transverse tubules |
myoblasts that persist in mature skeletal muscle | satellite cells |
plasma membrane of a muscle fiber | sarcolemma |
oxygen-binding protein found only in muscle fibers | myoglobin |
Ca+ storing tubular system similar to smooth endoplasmic retuculum | sarcoplasmic reticulum |
the contracting unit of a skeletal muscle fiber | sacomere |
middle area in the sarcomere where thick and thin filaments are found | A band |
area in the sarcomere where only thin filaments are present but thick filaments are not | I band |
separates the sacrcomeres from each other | Z disc |
area of only thick filaments | H zone |
cytoplasm of a muscle fiber | sarcoplasm |
composed of supporting proteins holding thick filaments together at the H zone | M line |
has fibers joined by intercalated discs | cardiac muscle |
thick and thin filaments are not arranged as orderly sarcomeres | smooth muscle |
uses satellite cells to repair | skeletal muscle |
striated | skeletal & cardiac muscle |
contraction begins slowly but lasts for long periods | smooth muscle |
has an extended contraction due to prolonged calcium delivery from both the sarcoplasmic reticulum and the interstitial fluid | cardiac muscle |
does not exhibit autorhythythmicity | skeletal muscle |
uses pericytes to repair damaged muscle fibers | smooth muscle |
uses troponin as a regulatory protein | skeletal muscle & cardiac muscle |
can be classified as single-unit or multiunit | smooth muscle |
can be autorhthmic | smooth |
uses calmodulin as a regulatory protein | cardiac muscle & smooth muscle |