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What else can I help you with?
What fibers cause a contraction in the ventricle?
Pirkinje Fibers
What does the sinoatrialnode release when it fires?
An action-potential which then travels to the Bundle of His and then the purkinje fibers to depolarize the ventricles to cause contraction.
What is a stimulus that results in no perceptible contraction?
A subthreshold stimulus is one that does not generate a strong enough signal to elicit a perceptible contraction in muscle fibers. It is below the threshold required to cause an action potential and result in muscle contraction.
The minimum stimulus needed to cause a contraction is called the?
The minimum stimulus needed to cause a contraction is called the threshold stimulus. This is the minimal level of stimulation required to activate muscle fibers and initiate a contraction response.
How does the t-tubule structure contribute to the contraction of muscle fibers?
The t-tubule structure in muscle fibers helps transmit electrical signals deep into the cell, allowing for coordinated contraction of the muscle fibers.
Do muscles fibers stretch during contraction?
No, they contract.
Why does the amplitude of the EMG signal and the force of contraction increase?
does the amplitude of the EMG signal and the force of contraction increase because a finite number of fibers or are fiting more often, or becasue more fibers are recruited to fire as the intensity of signals in the motorneurons increase, or a combination of the two?
What is the type of contraction in which the muscle fibers produce increased tension but does not shorten?
An isometric contraction builds tension but there is no joint movement.
Network that stimulates the myocardium into contraction?
His bundle? or the Purkinje fibers?
The Ca2 that is required for sustained contraction of smooth muscle fibers comes mainly from the?
extracellular fluid surrounding the fibers
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...
The ventricle contraction of the heart occurs iummediately after depolarization of the?
purkinje fibers
