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What is the job of a muscle cell?
Receive stimulatory impulses to contract and inhibitory impulses to stop contraction from the neuromuscular junction. This contraction is carried out by Ca2+, ATP and the actin and myosin proteins in the cells, forming a sarcomere. By contracting and relaxing as a syncytium, the leg muscle can control the joint(s) it crosses and produce movement.
What is the job of a leg muscle cell?
Receive stimulatory impulses to contract and inhibitory impulses to stop contraction from the neuromuscular junction. This contraction is carried out by Ca2+, ATP and the actin and myosin proteins in the cells, forming a sarcomere. By contracting and relaxing as a syncytium, the leg muscle can control the joint(s) it crosses and produce movement.
What usually triggers muscle fibers to contract or relax?
The contraction is triggered by the release of calcium within the muscle which is triggered by an electrical signal from a nerve.
How does neuronal firing cause muscle contraction?
When a neuron in a muscle is fired, or triggered, it sends a message to the brain telling the muscle to contract.
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.
What characterizes the normal operation of the heart?
each part contracts in a specific order. Contraction of the muscle is triggered by an electrical impulse. These electrical impulses travel through specialized cells that form a conduction system. Following this pathway ensures that contractions will
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 involved in muscle contraction in larger organisms?
Muscle contraction in larger organisms involves the sliding of actin and myosin filaments in muscle cells, which is triggered by the binding of calcium ions to regulatory proteins. This process leads to the overlap of filaments and shortening of the muscle, producing movement. Nerve impulses stimulate the release of calcium ions and initiate the contraction process in response to a signal from the nervous system.
What is the state of slight contraction present in healthy muscles?
The continuous partial contraction of muscle is called muscle tone
What do impulses passed from motor neurons release?
Impulses passed from motor neurons release neurotransmitters at the neuromuscular junction. This leads to the stimulation of muscle fibers and ultimately results in muscle contraction.
Heart excitation nerve impulses that result in heart muscle contraction originates in?
the pacemaker area or the sinoatrial node
What kinds of compounds in the body transmit impulses between nerve and muscle cells?
Neurotransmitters such as acetylcholine transmit impulses between nerve and muscle cells. These chemical messengers are released at the synapse where nerve and muscle cells meet, allowing for the transmission of signals that trigger muscle contraction.
