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What are the electrical impulses in the heart that are relayed to the ventricles by what?
A junction box, also known as the AV node, is how electrical impulses in the heart are relayed to the ventricles. The ventricles help make the muscle contract and then pump the blood.
Muscle fibers contract and relax in response to what?
nerve impulses
What tells muscles when to contract?
Muscles contract in response to signals from the nervous system. Motor neurons release neurotransmitters that stimulate muscle fibers to generate a contraction. This process is initiated by electrical impulses called action potentials that travel along the nerves to the muscle cells.
How does neuromuscular electrical stimulation work to improve muscle strength and function?
Neuromuscular electrical stimulation (NMES) works by delivering electrical impulses to the muscles, causing them to contract. This helps to strengthen and improve muscle function by activating muscle fibers that may not be effectively engaged through voluntary exercise alone. NMES can also help with muscle re-education and rehabilitation after injury or surgery.
What is responsible for conducting electrical impulses within the cardiac muscle?
Intercalculated Discs
What are fascicle in the heart for?
Fascicles in the heart are specialized bundles of muscle fibers responsible for conducting electrical impulses efficiently throughout the heart. They help coordinate the contraction of the heart chambers, ensuring effective and synchronized pumping of blood. This organized conduction system helps maintain the proper heartbeat rhythm and function of the heart.
What moves the bone?
Basically it's muscle. The brain sends the electrical impulse through the nervous system to the muscle(s) required to perform a certain task. The muscles receive the electrical impulses causing them to contract. Tendons connect muscles to bone, which allow the muscle's movement to pull the bone in the way you desire, allowing the body to move. Summary: Brain sends electrical signal to muscle, muscle tightens, pulls tendon which pulls bone.
Will the leg muscle contract when it is removed from the body and you pinch it?
No, as the muscle is dead (it doesn't contract like while the muscle is still alive either). However, it will contract if you give it an electrical "jump."
Does Electricity causes your muscles to contract?
Yes, electricity can cause your muscles to contract. This occurs because muscle contractions are triggered by electrical signals from the nervous system, which stimulate muscle fibers. When an electrical impulse reaches a muscle, it leads to the release of calcium ions, allowing the muscle fibers to contract. This principle is also utilized in medical therapies and devices, such as electrical stimulation for muscle rehabilitation.
How do electrolytes play a role in muscle contraction?
Electrolytes help regulate the electrical impulses that control muscle contractions. They maintain the balance of fluids inside and outside of muscle cells, allowing for proper muscle function. When muscles contract, electrolytes like sodium, potassium, and calcium are essential for transmitting signals between nerve cells and muscle cells.
Why does tetradotoxin lead to death?
It blocks the channel for sodium on the sceletal muscle and inhibits therefor the transmission of electrical impulses that are necessary for muscle contraction
What is the function of the transverse tubules in muscle cells?
The transverse tubules in muscle cells help transmit electrical impulses deep into the cell, allowing for coordinated muscle contractions.
