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Cardiac muscles are myogenic. The sinoatrial node initiates a wave of excitation that causes the atria to contract. The signal passes down into the atrioventricular node that acts as a relay station that causes a delay in the signal. This is done to prevent both atria and ventricle from contracting at the same time. The atrioventricular node sends the signal to the prukyne tissue that causes the ventricles to contract. After this the heart relaxes(diastole).- Marc

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Are you Nicotine? Cos u make my heart beat fast😂😂😂

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Are you Nicotine? Cos u make my heart beat fast😂😂😂

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1. Sino atrial (SA) node is stimulated by the wave of excitation in the atrial systole which cause the blood from the atria to flow to ventricles where the AV valves open and semilunar valves close during Atrial Systole.

2. In Ventricular Systole, the blood flows from ventricles and arteries where the semilunar valves open and AV valves close. The wave of excitation stimulates the purkyne fibres.

3. Lastly, in Diastole, the blood flows from atria to ventricles where the Av valves opens and semilunar valves close. Nothing is being stimulated by the wave of excitation in the stage.

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The sinoatrial node (SAN) in the right atrium initiates the rhythm of the heart. A wave of excitation initiated from the SAN spreads through both atria, both contract simultaneously and result in atrial systole. The signal does not immediately pass to ventricle as it is stopped by a band of non-conducting tissues at the base of atria. The electrical signal is passed from the atria to the atrioventricular node and is passed to the Purkyne tissue after a delay of 0.1 seconds. The excitation wave reaches the apex of the heart, conducting outwards and upwards, causing the ventricles to contract, results in ventricular systole.

-Anonymous

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The sino-atrial node (pacemaker) is located in upper wall of right atrium. It initiates an impulse which spreads to the right and left atrium.
Electrical impulse is picked

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SA node spreads the signal across atria wall,causes the both atria to contract. The signal stops for a few seconds before passing down to the AV node.This is to empty the blood in atria.AV node passes signal down the Purkyne tissue and reaches the apex of heart. The signal then spread the signals upwards the ventricle and causes the ventriclesto contract

Sii Hui

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cardiac muscles are myogenic. Sino-atrial, from the right atrium send out the rhythm in the form of electrical impulses to the walls of the atrium. Atrio-ventricular nodes receives the impulses and act as a delay. It amplifies the impulses and passes through purkyne tissues and reaches base of heart for ventricle walls to contract and afterwards it will relax thus cycle continues.
- Ching

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1. Sinoatrial node, which is found on the upper inside wall of the right atrium, initiates a heartbeat by setting up a wave of electrical excitation. This causes the atria to contract.
2. After a delay of 0.1s, the atriventricular node passes the wave onto the Bundle of His fibres which conduct impulses to Purkyne tissue.
3. The conducting fibres run down to the base of the septum and up along the ventricle walls, carrying impulses from bottoms upwards.
4. Ventricles contract bottom upwards, squeezing blood upwards into pulmonary artery or aorta.

-Anonymous

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The heart is made up fo cardiac muscles which are myogenic, that they do not require the impulses from the brain to contract. A sinoatrial node (SAN) that is located on the right atrium acts as a pacemaker which initiates the wave of excitation to the wall of the atria, which results in atria systole.
Blood flows down to the ventricle. The wave will stimulate the atrioventricular node (AVN) located at the septum, which acts as a relay station, allowing the emptying of the atria.
Purkyne fibres located at the septum conduct the excitation wave to the base of the heart, and then conducting outwards and upwards of ventricles, causing ventricle systole.
- Sze Jean

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1. Heart Beat Initiated by Sino-Atrial Node in the Right Atrium, Where An Electrical Impulse Travels across the AtriaL Walls, Causing it to Contract (Atrial Systole).
2. The Impulse reaches the Atrio-Ventricular Node at the Septum, Where there is a Delay of 0.1 Seconds. This Node Amplifies the Impulse and It travels downwards, Towards The Bundle of His (Purkyne Tissues) and then Upwards. This causes Ventricles To Contract.(Ventricular Systole).

3. Cardiac Muscle is Myogenic, Meaning it can Initiates it's own Electrical Impulse, Without the Help Of Nervous System.

~ Kimaya.

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Muscle in SAN contracts to produce electrical excitation wave, the wave sweeps through the atria of heart to cause the contraction of atria muscle.
Excitation wave reaches AVN. AVN delays the excitation wave for 0.1 second. The wave moves down through purkyne tissue after the delay. The wave reaches baseof ventricle. Ventricle wall contracts .-- Ang Ang

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1) The sinoatrial node locates at the right atrium sends a wave of excitation or electric imulse which spreads across the atrium walls. Atrium contracts or Atrial systole.
2) The impulse reaches the atrioventricular node which delays an impulse. Then the impulse passes through The purkyne tissue and reaches the base of the ventricles. The ventricle contacts or Ventricualr systole occurs and then relaxes. The whole cycle begins again.

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Sinoatrial node release wave of excitation to both atria wall causing atrial systole . The wave of excitation is then spread to atrioventricular node. AV node act as relay station to prevent contraction of atrial and ventricular at same time . The wave of excitation is then spread through purkyne fibre and swept through base of ventricle wall causing contraction of ventricle wall which is ventricular systole