Action Potential

 This is a short-lasting event which occurs when a neuron is sending electrical information down an axon ----in which the electrical membrane potential of a cell rapidly rises and falls.


Is anther word for irregular heartbeat leading to disturbance in the normal electrical rhythm of the heart.

Chordae Tendinae

Also known as 'heart strings', tendons that connect the papillary muscles to the Atrio-Ventricular valves.

Deoxygenated Blood

Blood with high concentrations of Carbon dioxide and low Oxygen concentrations.


 The term used for Relaxation of the heart

Oxygenated Blood

 Blood with high concentration of Oxygen.

Papillary Muscles

These are muscles used to hold the valves in position. They are only present in the ventricles.

Purkinje Fibres

Collection of tissue that conducts the wave of excitation transmitted from the Atrio-Ventricular node to the Bundle of His.

P wave

 is the signal from the SA node which spreads through both the atria and depolarises them.

PR interval

Indicates the time it takes for the electrical impulse to travel from the SA node to the AV node. It can also be a good idicator of how efficient the AV node is.
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