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9 kwi 2024 · Control of Contraction. Contraction of smooth muscle is not under conscious control, hence it is referred to as an involuntary muscle. Triggers for smooth muscle contraction include hormones, neuronal stimulation by the autonomic nervous system and other local factors.
Contraction of smooth muscle is initiated by a Ca 2+ -mediated change in the thick filaments, whereas in striated muscle Ca 2+ mediates contraction by changes in the thin filaments.
Understand the structure and function of smooth muscle tissue. By the end of this section, you will be able to: Understand the difference between single-unit and multi-unit smooth muscle; Describe the microanatomy of a smooth muscle cell; Explain the process of smooth muscle contraction; Explain how smooth muscle differs from skeletal muscle
The process of muscle contraction begins at the site where a motor neuron’s terminal meets the muscle fiber—called the neuromuscular junction (NMJ). Every skeletal muscle fiber in every skeletal muscle is innervated by a motor neuron at a NMJ.
Understand the structure and components of a sarcomere. Explain the process of skeletal muscle contraction. Differentiate between calcium ion sources in skeletal muscle and cardiac muscle. Recognize the structural differences between smooth and striated muscle and the relation to contraction.
30 lip 2022 · Muscle Contraction. The dense bodies and intermediate filaments are networked through the sarcoplasm, which cause the muscle fiber to contract. Although smooth muscle contraction relies on the presence of Ca ++ ions, smooth muscle fibers have a much smaller diameter than skeletal muscle cells.
Learning Objectives. By the end of this section, you will be able to: Describe the components involved in a muscle contraction. Explain how muscles contract and relax. Describe the sliding filament model of muscle contraction.
