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The action potential is conducted into a skeletal muscle fiber by?
The action potential is conducted into a skeletal muscle fiber by the depolarization of the motor end plate, which triggers the opening of voltage-gated sodium channels. This causes an influx of sodium ions into the muscle fiber, leading to depolarization and the initiation of muscle contraction.
Does skeletal muscle have T-tubules and what is their function in muscle contraction?
Yes, skeletal muscle has T-tubules, which are invaginations of the cell membrane that allow for the rapid transmission of action potentials deep into the muscle fiber. This helps to coordinate the contraction of muscle fibers by ensuring that all parts of the muscle fiber receive the signal to contract simultaneously.
What are the electrical events conducted along the cell plasma membrane that stimulate contraction?
Action potentials are conducted along the cell plasma membrane, triggering the release of calcium ions from the sarcoplasmic reticulum. The calcium ions then bind to troponin, initiating the sliding of actin and myosin filaments, leading to muscle contraction.
What is a T-tubule?
A T-tubule is a small, tube-like invagination of the cell membrane in muscle cells, particularly in cardiac and skeletal muscle. T-tubules help to transmit action potentials quickly into the cell interior, allowing for synchronous contraction of muscle fibers.
What action is exerted by the muscle on the bone?
skeletal
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
Is muscle action be voluntary?
We have three types of muscle tissue; smooth, cardiac, and skeletal. Skeletal muscle tissue is the only one of the three that are voluntary.
What type of muscle is excitable?
Excitable muscle refers primarily to cardiac and skeletal muscle. These types of muscle can respond to stimuli and generate action potentials, allowing for contraction. Smooth muscle also exhibits excitability, but it is less striated and functions involuntarily. Overall, excitable muscles are essential for movement and various physiological processes in the body.
What site of action for skeletal muscle relaxants is the?
limbic system
Explain the source of signals detected by the EMG electrodes?
Action potentials along the muscle fibers
Which electrolytes are important in action potentials and the excitability of nervous and muscle tissue?
Na,K and Ca
Which motor neuron is in charge of muscle contraction?
The motor neuron responsible for muscle contraction is the alpha motor neuron. These neurons reside in the spinal cord and project to skeletal muscles, where they release the neurotransmitter acetylcholine at the neuromuscular junction. This release initiates muscle contraction by triggering action potentials in muscle fibers, leading to their shortening and generating movement.
