Pirkinje Fibers
The right bundle carries nerve impulses that cause contraction of the right ventricle (the lower chamber of the heart) and the left bundle carries nerve impulses that cause contraction of the left ventricle.
An action-potential which then travels to the Bundle of His and then the purkinje fibers to depolarize the ventricles to cause contraction.
blood to flow into the pulmonary circulation
The wave of contraction in heart is initiated by S.A. Node which leads left auricles to contract. This wave of contraction is received by A.V.Node which contracts right auricle and spreads the wave of contraction to bundle of his and finally to purkinje fibre which contracts the two ventricles simultaneously anterioposteriorly. Therefore sequence of contraction is 1Left Auricle 2 Right auricle 3 ventricle
the atria contracts first then the ventricle hencep qrs
purkinje fibers
Actin and myosin are two fibers that cause contraction.
The right bundle carries nerve impulses that cause contraction of the right ventricle (the lower chamber of the heart) and the left bundle carries nerve impulses that cause contraction of the left ventricle.
An action-potential which then travels to the Bundle of His and then the purkinje fibers to depolarize the ventricles to cause 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.
Extrasystole is due to the irregular contraction of the ventricle before the atria. When this happens, an action potential is elicited and the ventricle contracts. The action potential had a refractory period, during which the intrinsic heart rate attempts to fire but cannot elicit a contraction. This is why extrasystole is often referred to as skipping a beat. The compensatory pause is the time it takes for the beat to resume normal contraction.
blood to flow into the pulmonary circulation
2
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.
The t-tubule structure in muscle fibers helps transmit electrical signals deep into the cell, allowing for coordinated contraction of the muscle fibers.
No, they contract.
The mitral valve allows blood to enter the left ventricle from the left atrium during contraction of the left ventricle. This valve opens to allow blood flow from the atrium to the ventricle and then closes to prevent backflow of blood.