9.3 - Skeletal Muscle Fibers

Muscle contraction

________ depends on actin /myosin- containing myofilaments.

myomesin

Nebulin, ________, and C proteins bind filaments and sarcomeres to maintain alignment.

Tropomyosin

________ stiffens and stabilize the actin cores.

Sarcoplasmic reticulum

________ regulates intracellular levels of calcium ions.

Troponin

________ is a globular protein with 3 subunits.

Sarcoplasm

________ contains lots of glycosomes and myoglobin.

Myoglobin

________- red pigment that stores oxygen.

Myofibrils

________ are made up of chains of sarcomeres.

Sarcomeres

________ are made up of myofilaments.

Muscle cell

________ contains 3 specialized structures: myofibrils, sarcoplasmic reticulum, and T tubules.

skeletal muscle fiber

Each ________ is a long cylindrical cell with multiple nuclei beneath its plasma membrane.

Muscle fibers

________ are long (up to 30 cm) and are wide (up to ten times a body cell)

sarcomere

A(n) ________ is the region between two successive Z disks, and is the smallest contractile unit of the muscle fiber.

Sarcolemma

plasma membrane of a muscle fiber

glycosomes

granules of stored glycogen

Muscle cell contains 3 specialized structures

myofibrils, sarcoplasmic reticulum, and T tubules