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The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell. Depolarization triggers the release of calcium ions from the sarcoplasmic reticulum inside the muscle cell. In the presence of ATP, the high calcium level causes the myosin heads to bend, dragging actin filaments towards the middle of the unit of contraction.
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What happens to a muscle when an electrical impulse from a nerve stops?
When the electrical impulse from a nerve stops, the muscle relaxes and returns to its resting state. This is because the nerve impulse initiates the release of calcium ions in the muscle cells, leading to muscle contraction. When the nerve impulse stops, the calcium ions are reabsorbed, causing the muscle to relax.
What minerals are needed for muscle contraction and conduction of nerve impulses?
Minerals such as calcium, magnesium, sodium, and potassium are essential for muscle contraction and nerve impulse conduction. Calcium is particularly important for initiating muscle contractions and transmitting nerve impulses, while magnesium, sodium, and potassium help regulate muscle relaxation and contraction as well as nerve impulse transmission.
How long does it take for a nerve impulse to be transmitted across the synaptic cleft resulting in a downstream muscle contraction?
The transmission of a nerve impulse across the synaptic cleft typically takes around 1 to 2 milliseconds. When the nerve impulse reaches the axon terminal, neurotransmitters are released into the synaptic cleft, binding to receptors on the muscle cell membrane. This process triggers a cascade of events that lead to muscle contraction, usually occurring within a few milliseconds after neurotransmitter binding. Overall, the entire process from nerve impulse to muscle contraction can occur in less than 10 milliseconds.
What is stimulation of a muscle by an impulse transmitted by a motor nerve?
Stimulation of a muscle by an impulse transmitted by a motor nerve refers to the process where a nerve signal triggers muscle contraction. When a motor neuron is stimulated, it releases neurotransmitters at the neuromuscular junction, leading to depolarization of the muscle cell membrane. This depolarization causes calcium ions to be released within the muscle fibers, ultimately resulting in the contraction of the muscle. This process is essential for voluntary movements and muscle coordination.
What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
The structures within the muscle fiber that shorten to cause skeletal muscle contraction are called myofibrils. Myofibrils are composed of repeating units called sarcomeres, which contain thick and thin filaments made of proteins (actin and myosin). When the muscle fiber is stimulated by a nerve impulse, the myosin heads interact with the actin filaments to generate the force required for muscle contraction.
Do motor nerves cause muscles to move?
Yes, motor nerves are responsible for stimulating muscle movement. They transmit signals from the central nervous system to muscle fibers, leading to contraction and movement. When a motor nerve impulse reaches a muscle, it triggers the release of neurotransmitters at the neuromuscular junction, which initiates muscle contraction. This coordinated process allows for voluntary and involuntary movements throughout the body.
What must be present for a nerve impulse to begin?
each nerve impulse begins in the dendrites of a neuron's. the impulse move rapidly toward the neuron's cell body and then down the axon until it reaches the axon tip.a nerve impulse travels along the neuron in the form of electrical and chemical signals.Brain send the message via nerve impulses involving neurons which use the neuro-transmitter AcetylcholineAcetylcholine- a neurotransmitter released at the neuromuscular junction triggers a muscle action potential, which leads to muscle contraction.
Is depolarization the same as contraction in the heart?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell.
The axon terminals of a nerve cell and the sarcolemma of a skeletal muscle cell join at the?
The axon terminals of a nerve cell and the sarcolemma of a skeletal muscle cell join at the neuromuscular junction. This is where the nerve impulse triggers the release of neurotransmitters, such as acetylcholine, which initiate muscle contraction by binding to receptors on the sarcolemma.
Which muscle trait is the ability to respond to a stimulus such as a nerve or hormone?
Muscle excitability is the ability to respond to a stimulus, such as a nerve signal or hormone, by generating an electrical impulse that leads to muscle contraction. This trait allows muscles to react to signals from the nervous or endocrine systems to produce movement.
When a single neuron sends a strong enough impulse to a muscle that how many muscle fibers does it cause to contract?
When a single neuron sends a strong enough impulse to a muscle, it can cause multiple muscle fibers within that muscle to contract. The specific number of muscle fibers that contract will depend on factors like the size of the motor unit and the intensity of the signal from the neuron.
Describe the path a nerve impulse travels throughout your body from stimulus to response?
Brain send the message via nerve impulses involving neurons which use the neuro-transmitter AcetylcholineAcetylcholine- a neurotransmitter released at the neuromuscular junction triggers a muscle action potential, which leads to muscle contraction
