Describe the electrical conductance system of the heart?
An excitation signal (an action potential) is created by the sinoatrial (SA) node.The wave of excitation spreads across the atria,causing them to contract.Upon reaching the atrioventricular (AV) node, the signal is delayed.It is then conducted into the bundle of His, down the interventricular septum.The bundle of His and the Purkinje fibres spread the wave impulses along the ventricles, causing them to contract.
JS
Related Science GCSE answers
All answers ▸How has the camel [shown, with summarising information] adapted to survive the desert? Briefly explain adaptation by natural selection.
What two products are produced when a metal and an acid are added together
Describe how a protein is digested
How does blood circulate through the heart?