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36 Cards in this Set
- Front
- Back
What are the 3 concentric wrappings of connective tissue of muscle? |
1. Enodmysium 2. Perimysium 3. Epimysium |
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this type of concentric connective tissue binds fibers to their neighbors and supports the capillaries that supply the fibers |
Endomysium |
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the muscle fibers bound together by the endomysium form a bundle called a __________. |
fascicle |
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This connective tissue has fascicles that are surrounded by CT containing collagen and elastic fibers that supports the blood vessels and nerves that serve the fibers of the fascicles. |
perimysium |
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the entire muscle is surrounded by dense CT that separates the muscle from the surrounding tissue and organs. This is the ____________. |
epimysium |
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When the attachment of muscle is broad and forms a sheet it is called an _____________ |
aponeurosis |
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Each muscle fiber is also controlled by a nerve that forms a single attachment point with each fiber eat the _______________________. |
neuromuscular junction |
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skeletal muscle cells develop when hundreds of individual embryonic cells called _____________ fuse. |
myoblasts |
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the resulting cells' cell membrane from the fused myoblasts is called _______________. |
sarcoplasm |
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skeletal muscles are very __________ |
large and multinucleate |
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Some myoblasts do not fuse but remain associated with the fiber as ______________ that divide and differentiate to repair damaged cells. |
satellite cells |
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there are internal tubular extensions of the sarcolemma into the sarcoplasm called _________________. |
transverse or T tubules |
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within each skeletal muscle cell or fiber there are cylindrical structures called ____________. |
myofibrils |
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in-between the loops of transverse tubules, there is a network of tubules of smooth endoplasmic reticulum called the ___________________ |
sarcoplasmic reticulum. |
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The sarcoplasmic reticulum on either side of the loops of transverse tubules fuse to form expanded chambers called _______________. |
terminal cisternae |
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the combination of a transverse tubule flanked by two terminal cisternae is called a _____________ |
triad |
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What surrounded the myofibrils as a ready source of fuel? |
glycogen granules |
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what are the myofibrils made up of? |
myofilaments |
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the myofilaments are organized in repeating units along the length of the myofibril called ____________. |
sarcomeres |
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the primary microfilaments in myofibrils are _______ (thin) and ________ (thick) filaments |
actin, myosin |
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what is responsible for the banding pattern of the thick and thin filaments? |
the difference in size and density |
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what can you find in the center of the sarcomere? |
narrow H band |
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What is the H band in the center of? |
the A band |
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which band is where the thin filaments do not overlap with the thick filaments at either end of the sarcomere, and straddling the Z line? |
I band |
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the thick filaments are linked in the center of the sarcomere by proteins that form the _________. |
M line |
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At either end of the sarcomere, the actin filaments are attache to one another by proteins that form the ________ |
Z line |
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What is the thin filament composed of? |
G-actin protein molecules that form a linear molecule called F-actin. |
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What holds F-actin together? |
nebulin |
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What does each G-actin have? |
an active site that binds to a site on the myosin molecule. |
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What prevents the binding of myosin and the active site? |
protein called tropomyosin |
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What holds the tropomyosin in position ? |
troponin |
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What must bind to troponin in order for the position of tropomyosin to change to uncover the binding site and permit the binding of actin and myosin? |
calcium ions |
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at either end of the sarcomere the actin filaments are attached to the Z line or disc by a protein called ___________. |
actinin |
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What is the connection of thin filaments and the head myosin head called? |
cross-bridges |
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the thick filaments are associated with a protein called? |
titin |
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what does titin do? |
contributes to the normal alignment of the thick and thin filaments and has elastic properties that restores the sarcomere to its original resting position after being stretched. |