Human Bio Unit 1 - Electrical System of the Heart Flashcards
0
Q
Bundle of his
A
Specialised muscle fibres
In the septum
1
Q
Electrical steps
A
Wave of depolarisation from the SAN spreads across both atria
Atria contract
Impulse reaches the AVN
Short delay of about 0.1s
Impulse is transmitted along bundle of his
Impulse reaches apex of heart
Wave passes through purkinje fibres to mycoctyes in the walls of ventricles
Ventricles contract
Muscle cells of ventricle depolarise during diastole
2
Q
Purkinje fibres
A
Specialised muscle fibres
