What is the function of the sarcoplasmic reticulum in skeletal muscle tissue?
By regulating the concentration of calcium in the sarcoplasm (the cytoplasm of striated muscle cells), the sarcoplasmic reticulum plays an important role in determining whether muscle contraction occurs.
What is the role of the sarcoplasmic reticulum in muscle contraction quizlet?
Calcium release from the sarcoplasmic reticulum initiates the contraction. Sodium release from the sarcoplasmic reticulum initiates the contraction. Action potentials propagate into the interior of the skeletal muscle fiber.
What is a function of contracting skeletal muscle?
The best-known feature of skeletal muscle is its ability to contract and cause movement. Skeletal muscles act not only to produce movement but also to stop movement, such as resisting gravity to maintain posture.
What is the main function of sarcoplasmic reticulum?
The sarcoplasmic reticulum (SR) constitutes the main intracellular calcium store in striated muscle and plays an important role in the regulation of excitation-contraction-coupling (ECC) and of intracellular calcium concentrations during contraction and relaxation.
What is the sarcoplasmic reticulum How does it aid in the stimulation of muscle contraction?
Explanation: The main function of the sarcoplasmic reticulum is to store and release calcium ions. Calcium ions released into the cytoplasm of a muscle cell activate troponin. Myosin head binds to actin, which causes muscle contraction.
What is the main function of the sarcoplasmic reticulum quizlet?
The major function of the sarcoplasmic reticulum is to sequester phosphate ions for the production of ATP. A motor unit is considered to be a nerve fiber and all the muscle fibers it innervates.
What is the main function of Ca2+ ions during muscle contraction quizlet?
What is the role of calcium ions in the contraction of skeletal muscle? The release of calcium ions triggers the immediate regeneration of creatine phosphate to power the contraction. Calcium ions bind to the troponin-tropomyosin complex and remove their inhibitory action on actin/myosin interaction.
What is the contraction of skeletal muscles based on?
Muscle contractions can be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle tension remains the same throughout the contraction.
What occurs during skeletal muscle contraction?
When signaled by a motor neuron, a skeletal muscle fiber contracts as the thin filaments are pulled and then slide past the thick filaments within the fiber’s sarcomeres. This process is known as the sliding filament model of muscle contraction (Figure 10.10).
What is the role of sarcoplasmic reticulum in the sliding filament theory?
Surrounding each myofibril (remember a myofibril is the portion of the muscle fibre that houses actin and myosin) is a system of tubules called the sarcoplasmic reticulum. The sarcoplasmic reticulum stores calcium and it is the regluation of calcium release that causes muscular contraction.
What is the role of the sarcoplasmic reticulum prior to a muscle contraction?
The sarcoplasmic reticulum is responsible for the storage of calcium ions that are used in muscle contraction. Prior to a contraction, an action potential will reach the sarcoplasmic reticulum, making it permeable to calcium ions.
Which of the following best describes the function of the sarcoplasmic reticulum in a muscle cell?
Which of the following best describes the function of the sarcoplasmic reticulum in a muscle cell? Storage and release of calcium ions.
