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What is the coupling in skeletal muscle?

What is the coupling in skeletal muscle?

First coined by Alexander Sandow in 1952, the term excitation–contraction coupling (ECC) describes the rapid communication between electrical events occurring in the plasma membrane of skeletal muscle fibres and Ca2+ release from the SR, which leads to contraction.

What is the process of excitation-contraction coupling in skeletal muscle?

Excitation–contraction coupling is the physiological process of converting an electrical stimulus to a mechanical response. It is the link (transduction) between the action potential generated in the sarcolemma and the start of a muscle contraction. Figure 38.4F.

What is the plasma membrane of a skeletal muscle called Why?

The Skeletal Muscle Fiber. Skeletal muscle cells or fibers are highly elongated cells with a very elastic and resistant plasma membrane, called the sarcolemma. Fibers are characterized by the presence of numerous nuclei located at the periphery of the cell, hence muscle fibers are described as a syncytium.

What is the plasma membrane of a skeletal muscle cell?

the sarcolemma
As mentioned earlier, the plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma invaginates into the cytoplasm of the muscle cell (sarcoplasm). This forms membranous tubules that pass across the muscle cells.

Which of the following occurs first during EC-coupling?

The EC-coupling cycle involves the following sequence of events: (1) depolarization of the plasma membrane and its membrane invaginations (the t-tubular system) by an action potential; (2) transduction of the depolarization signal to the sarcoplasmic reticulum (SR) membrane; (3) activation of Ca2+ release from the SR …

Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers?

Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers? Acetylcholine. Action potentials.

What occurs during excitation contraction coupling quizlet?

Excitation refers to the propagation of action potentials along the axon of a motor neuron. Excitation-contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired.

Which of the following connects cross bridges during muscle contraction?

If present, calcium ions bind to troponin, causing conformational changes in troponin that allow tropomyosin to move away from the myosin binding sites on actin. Once the tropomyosin is removed, a cross-bridge can form between actin and myosin, triggering contraction.

What is name muscle membrane?

The plasma membrane of muscle fibers is called the sarcolemma (from the Greek sarco, which means “flesh”) and the cytoplasm is referred to as sarcoplasm (Figure 10.2.