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Papers > Science > muscle tissue
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muscle tissue |
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... Antagonists work opposing each other in muscle flexion and extension. ... You should read on your own “structure” of skeletal muscle. Skeletal muscle is striated and voluntary and makes up the muscles that work with our skeletal system. ... 301 for Rigor Mortis These are not the only proteins needed in muscle movement. ... EXCITATION-CONTRACTION COUPLING This is the sequence of events bringing about an action potential of a muscle fiber leading to the cross-bridge activity described previously. Skeletal muscle membrane can bring about an action potential such as a nerve cell can. ... The action potential produces an increase in cytosolic calcium concentrations which control muscle contraction. In resting muscle, the concentration of calcium ions is low. ... The T-tubule or transverse tubule system crosses the muscle fiber at the level of the A-I junction passing between two lateral sacs and joining the plasma membrane. ... ATP is needed for the calcium pump and is now the third major role of ATP in muscle contraction. What activates an action potential in skeletal muscle? ... Motor neurons innervate skeletal muscle cells. The cell body is within the brainstem and spinal cord and the axons pierce the muscle. When the axon of a motor neuron hits the cell it branches off forming a single junction with each muscle fiber. A single motor neuron innervates many fibers but each muscle fiber is controlled by only one motor neuron. ... The myelin sheath of a motor neuron axon ends near the surface of the muscle fiber and the axon divides into a number of short processes that lie embedded in grooves on the muscle-fiber surface. This region of the muscle fiber membrane that lies directly under the terminal portion of the axon has special properties and is called the motor end plate. ... More sodium comes in than potassium out, this is known as the end-plate potential (EPP) One EPP is enough to depolarize the muscle membranes adjacent to the end-plate membrane to its threshold initiating an action potential. Most neuromuscular junctions are found at the center of the muscle cell and go in both directions. ... Another difference is all skeletal muscle neuromuscular junctions are excitatory and do not have a refractory of hyperpolarization period. ... Force exerted on an object by a contracting muscle is tension, on the muscle by an object is the load. ... Tension must be greater than the opposing load for the muscle to move a load. When a muscle develops tension but doesn’t shorten it is isometric or constant in length. A contraction where muscle shortens while the load is constant is isotonic or constant tension. ... Here the load pulls muscle to a longer length in spite of opposing forces being produced. ... The response of a single muscle fiber to an action potential is a twitch. ... This is before the tension in muscle fiber begins to increase. We have both slow and fast twitch muscle fibers which indicates not all muscle fibers have the same contraction time. |
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Title: muscle tissue
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