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What is the sequence of structures that action potentials must move through to excite skeletal muscle contraction?
Wiki User
∙ 9y ago
Excitation begins as a motor neuron transmits an action potential to the neuromuscular junction where it gets propagated along the muscle cell. This action potential is an electrical impulse that depolarizes the muscle cell membrane, the sarcolemma, which then releases ions in the sacroplasmic reticulum and transverse tubules. When this happens calcium is released into the sarcomeres that contain actin and myosin myofilaments. The calcium unlocks the binding sites and creates crossbridges with the globular heads on the mysoin fibers. With ATP as the energy source, this crossbridging brings the Z-lines closed together and the muscle fiber contracts.
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoAxon of neuron, sarcolemma, and T-tubules
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What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
Myofibrils
How can gradation of skeletal muscle contraction be accomplished?
controlled output of action potentials, progressive recruitment of motor units, control of the rate of attachment/reattachment of actin and myosin heads and the power stroke rate
What type of muscle is capable of rapid contraction and causes skeletal movement?
Skeletal or voluntary muscle is capable of rapid contraction and is responsible for skeletal movement.
Does stretch have any effect on skeletal muscle contraction?
yes skeletal muscle stretch by means of contraction.
What affect does lowering extracellular calcium have on the resting membrane potential of a neuron?
Low calcium levels in the extracellular fluid increase the permeability of neuronal membranes to sodium ions, causing a progressive depolarization, which increases the possibility of action potentials. These action potentials may be spontaneously generated, causing contraction of skeletal muscles (tetany).
Action potentials are conducted into a skeletal muscle fiber by?
C. neuromuscular junctions
The first step toward generating a skeletal muscle contraction is The first step toward generating a skeletal muscle contraction is?
stimulation of the muscle by a nerve ending.
What band shortens during skeletal muscle contraction?
during skeletal muscle contraction ,I band and H zone shortens. Sarcomeres
Do skeletal muscles have involuntary muscle?
The skeletal muscles do have the involuntary muscle because they help it in the contraction process.
The action potential is conducted into a skeletal muscle fiber by?
neuromuscular junctions Action potentials conduct down T tubules into skeletal muscles
What muscles are straited?
smooth skeletal cardiac and contraction mbroro
Basic unit of contraction in skeletal and cardiac muscle?
The Sarcomere
