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Chapter 12

Terms in this set (20)

Actin
thin filaments
Myosin
thick filament
Z line
(Z-end) A dark thin protein band to which actin filaments are attached in a striated muscle fiber, marking the boundaries between adjacent sarcomeres.
M line
Middle of myosin filaments- middle of sarcomere
I band
I is a thin letter- thin filaments only
H zone/band
H is a thick letter- central part of A bands where there are no thin filaments present only thick filaments
A band
all of the thick and some of the thin filaments
Titin filaments
acts like a spring and anchors the actin and myosin together
Sarcomeres are attached end to end to form
myofibrils
Myofibrils are surrounded by
sarcoplasmic reticulum
Sarcoplasm
cytoplasm of a muscle fiber
Sarcolemma
plasma membrane of a muscle fiber
T-tubules (transverse tubules)
spread the action potential into the interior of the muscle fiber
two supplemental energy reserves in muscle
creatine phosphate and myoglobin
Difference of oxygen needed by muscles and oxygen available
oxygen debt
Volkmann's canals
In bone, channels lying at right angles to the central canal, connecting blood and nerve supply of the periosteum to that of the Haversian canal
Haversian canal
Channels in bone that contain blood vessels and nerves
Lacunae
small cavities in bone that contain osteocytes
Canaliculi
Hairlike canals that connect lacunae to each other and the central canal
intramembranous ossification
process by which bone forms directly from mesenchymal tissue- eg-skull bones
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