Quiz: Structure of Skeletal Muscle

1. In order for muscles to contract, they need calcium ions. Muscle cells have an organelle that stores the needed calcium ions. This organelle is called __________.
a. fascia
b. sarcolemma
c. sarcoplasmic reticulum
2. Myosin cross-bridges are extensions of __________.
a. actin
b. myosin
c. troponin
3. The membrane around a muscle cell is called a __________.
a. sarcoplasm
b. sarcolemma
c. sarcomere
4. The actin filaments are attached to the __________.
a. Z discs
b. myosin
c. sarcolemma
5. The troponin/tropomyosin complex is associated directly with which of the following filaments?
a. actin
b. myosin
c. the thick filament

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