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lab practical 2 NTK List 9
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a band
The component of the sarcomere that appears darker because it contains thick filaments and areas in which the thick and thin filaments overlap.
Actin
A bead-shaped contractile protein found in muscle fibers and motile cells
Elastic Filamet
A myofilament that consists of the structural protein titin.
Endomysium
meaning within the muscle, is a wispy layer of areolar connective tissue that ensheaths each individual myocyte
Epimysium
a sheath of fibrous elastic tissue surrounding a muscle.
i band
The component of the sarcomere that appears lighter because it contains only thin filaments.
h zone
the zone of the thick filaments that is not superimposed by the thin filaments.
m line
the attachment site for the thick filaments
Motor End Plate
The specialized region of the skeletal muscle fiber plasma membrane that contains receptors for acetylcholine.
Muscle Fiber
An alternate name for a skeletal muscle cell.
Myofibril
Long, cylindrical organelles composed of muscle proteins in a muscle fiber.
myosin
A club-shaped contractile protein found in muscle fibers and motile cells
neuromuscular junction
The location where a neuron communicates with a muscle fiber.
Sarcolemma
The plasma membrane of a muscle fiber.
Sarcomere
The functional unit of muscle contraction; consists of the area of the myofibril from one Z-disc to the next Z-disc.
Sarcoplasmic Reticulum
The specialized smooth endoplasmic reticulum of a muscle fiber that stores calcium ions.
terminal Cisternae
Enlarged regions of the sarcoplasmic reticulum where it contacts T-tubules.
thick filament
A myofilament composed of many molecules of the protein myosin.
thin filament
A myofilament composed of molecules of the proteins actin, troponin, and tropomyosin.
triad
the structure formed by a T tubule with a sarcoplasmic reticulum (SR) known as the terminal cisterna on either side.
tropomyosin
a protein involved in muscle contraction. It is related to myosin and occurs together with troponin in the thin filaments of muscle tissue.
troponin
a complex of muscle proteins which, when combined with Ca++, influence tropomyosin to initiate contraction.
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Author
bkwatts
ID
326099
Card Set
lab practical 2 NTK List 9
Description
AP Lab Pracical
Updated
2016-11-29T03:51:16Z
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