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Succinylcholine acts as a depolarizing agent that prevents repolarization of the nerve. Name a site within the neuromuscular junction that might be affected to prevent the muscle contraction?
Wiki User
∙ 11y ago
It can act presynaptically on Nicotinic 2 receptors which increases the release of AcH potentiating the block at the motor end plate.
Wiki User
∙ 11y ago
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During which portion of the cardiac cycle is it possible to induce extra systole?
Extrasystole is an extra ventricular systole that happens during the begging of relaxation (repolarization). Since the cardiac is able to depolarize only after repolarization, any stimulus upon the repolarization period created an increased ventricular contraction or which is also called extrasystole but not a new contraction.
What is acetylecholine?
Acetylcholine is a neurotransmitter that helps transmit electrical nervous impulses from one nerve to another. Commonly found when a nerve terminates in a muscle (the neuromuscular junction) to cause contraction.
Muscle tissue consists of cells that are highly specialized for the function of?
Contraction.
Some muscle fibers always contracted?
Summation and/or tetanic contraction. Summation is increased muscle contraction until maximal sustained contraction is achieved. Tetanic contraction is sustained muscle contraction without relaxation. If you're inquiring for the Learning Objective Review in an anatomy and physiology course, the question refers to a condition in which some fibers are always contracted... so I'm not sure if they're looking for summation or tetanic contraction - but I think it would be tetanic contraction as summation is more the process leading up to the tetanic contraction...
Which region of a sarcomere shortens during contraction?
During a contraction, the I bands and H zone of a sarcomere contract. The A bands remain unchanged.
What is another site within the neuromuscular junction that might be affected to prevent muscle contraction?
The motor endplate is the is the large, complex terminal formation by which a motor neuron axon establishes synaptic contact with a striated muscle fiber. While succinylcholine produces motor endplate depolarization at the neuromuscular junction to prevent acetylcholine release, curare and medical derivatives such as tubocurarine are non-depolarizing neuromuscular blocking agents that inhibit depolarization by blocking acetylcholine from binding to receptors on the motor endplate (i.e., the curare site of action is the nicotinic acetylcholine receptors on the postsynaptic membrane of the neuromuscular junction). Curare occupies the agonist position in competition against acetylcholine.
What does ventricular repolarization result in?
contraction
The period during which the ventricles are depolarizing which precedes their contraction?
QRS wave
What does ach do at a neuromuscular junction?
ACh (acetylcholine) binds to receptors at the NMJ (neuromuscular junction) to induce contraction of muscle.
What is a sustained muscle contraction?
Occurs when acetylcholine (ACh) accumulates in the neuromuscular junction. It is called a tetanic contraction.
During which portion of the cardiac cycle is it possible to induce extra systole?
Extrasystole is an extra ventricular systole that happens during the begging of relaxation (repolarization). Since the cardiac is able to depolarize only after repolarization, any stimulus upon the repolarization period created an increased ventricular contraction or which is also called extrasystole but not a new contraction.
When a muscle contracts and relax it is called?
Spasm
What are the 3 components of the ECG trace?
The EKG or ECG components are the P wave (contraction of the atria), the QRS complex (the contraction of the ventricles) and the T wave (repolarization of the ventricles).
At the neuromuscular junction, the muscle contraction initiation event is?
binding of acetylcholine to membrane receptors on the sarcolemma
Skeletal muscle fiber contraction begins when?
Acetylcholine is released into the neuromuscular junction by the axon terminal
What is the medical term meaning a neuromuscular disorder charaterized by by the slow relaxation of the muscle after a voluntary contraction?
Myotonia
Describes a neuromuscular disorder characterized by the slow relaxation of the muscles after a voluntary contraction?
Myotoniamyotonia
