Criado por Sam Gunnell
mais de 5 anos atrás
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Questão | Responda |
The cardiac muscle automatically contracts and relaxes without nerve stimulation, so it is described as...? | Myogenic |
What initiates the cardiac cycle? | Sino-atrial node (SAN) |
Where is the SAN located? | Walls of right atrium |
What prevents the electrical wave passing to the ventricles as well the atria? | A band of collagen fibres between the aorta and ventricles |
How does the electrical impulse get to the ventricles? | Through the AVN but it delays the wave so that blood can get into the ventricles before they contract |
What is the pathway of the electrical impulse? | SAN AVN Purkyne fibres Bundle of his |
What do the purkyne fibres do? | Conducts electrical impulses up and outwards through the ventricle walls |
What factors can effect heart rate? | Age Fitness level Medical conditions Diet |
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