Microscopic Anatomy of Skeletal Muscle The plasma membrane of muscle cells is called the ______________. Inside are rod-shaped organelles with alternating A and I bands called ______________ that make the cell look striated. The contractile units of these organelles are called ______________. The thread-like proteins that cause contraction are the thick, or ______________ myofliaments and the thin, or ______________ myofliaments. The ______________ is specialized to store and release ______________ ions to trigger contraction.
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Step 1: The plasma membrane of muscle cells is called the sarcolemma. Show more…
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Terminal cisternae A cylindrical organelle made up of myofilaments and found within the sarcoplasm of the muscle cell. Myosin Sarcomere A modified smooth endoplasmic reticulum that surrounds each myofibril and stores Ca2+. Sarcolemma The plasma membrane of a muscle cell. Transverse (T) tubule Formed by an invagination of the sarcolemma. Sarcoplasmic reticulum Myofibril Made up of the T-tubule and two terminal cisternae. Sarcoplasm Enlargements of the SR on either side of the transverse tubules. Triad Contractile proteins that make up the thick filaments. Actin Contractile protein that makes up the thin filaments. Cytoplasm of a muscle cell. Functional unit of muscle contraction.
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