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What is muscle contraction without muscle shortening is what kind of contraction?
Isometric contraction
Which wave is larger the one for atrial contraction or the one for ventricular contraction?
Ventricular contraction wave is larger
As a wave of electrical depolarization moves parallel to the direction of a lead if it moves towards the positive pole of the lead a?
POSITIVE
What describes the events of contraction in excitation-contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What is the difference between contraction and expansion?
In contraction the size of item becomes smaller. In contract, expansion increases it.
What is the key intracellular event that stimulates muscle contraction?
Depolarization
The ventricle contraction of the heart occurs iummediately after depolarization of the?
purkinje fibers
What part of an ECG represents ventricular depolarization?
Okay so an EKG show the electrical impulse that travels through the heart. What I mean is EKG don't show contraction. However the QRS complex represent ventricular depolarization, which signals ventricular contraction
What contraction of the atria results from which wave of depolarization on the ECG tracing?
P wave
Which pump is responsible for muscle contraction through depolarization of muscle cell membrane?
Ca2+
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.
What part of an ecg do atria contract?
Atrial depolarization occurs at the P wave. The atrial contraction occurs at the peak of the wave at the influx of calcium ions to prolong depolarization.
What part of the ECG records atrial contraction?
ECG records electrical activity and not mechanical, hence it has nothing to do with contraction. But P wave represents atrial depolarization.
What is the contraction for he did?
There is no contraction. The contraction she'd can mean she had or she would.
How does the nerve impulse cause contraction of the muscle?
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.
The greater influx of sodium ions results in what of the membrane?
depolarization
What does the P wave indicate?
The P wave indicates the depolarization (contraction) of the atria.Source: Chon, Elizabeth Gross, and Gilroy-Doohan, Mary,Flip and See ECG, W.B. Saunders Company
