WorksheetsMechanism of Hertbeat
Total questions: 6
Worksheet time: 3mins
The SA node is called the pacemaker of the heart because it ____________.
allows both atria to contract rapidly in response to a signal from one node.
relays the regulated impulses throughout the heart
initiates the heartbeat through cells
has unique muscle fibers that can function without external stimulation.
In what order are the impulses transmitted?
SA Node, AV Node, Bundle of His, Purkinje Fibers
AV Node, SA Node, Bundle of His, Purkinje Fibers
SA Node, Bundle of His, AV Node, Purkinje Fibers
AV Node, Bundle of His, Purkinje Fibers, SA Node,
The delay at the AV node supports coordinated blood flow through the heart by _____.
increasing the power of the impulse to maintain its flow through the Bundle of His
triggering the ventricles to expand in rhythm with the impulses from the Bundle Branches
allowing the atria time to push blood into the ventricles right before the ventricles contract
allowing the atria to contract simultaneously as soon as the SA node sends the impulse
Name the main heart pacemaker.
Atrioventricular node
Purkinje fibres
Bundle of His
Sinoatrial node
The first 'lub' sound is produced when ________ close.
tricuspid valve
tricuspid vale and bicuspid valve
semilunar valve
bicuspid valve
Closing of semilunar valves produce the second sound '____________'.
'dub'
'dap'
'tab'
'lap'
