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Worksheetscoordination of heart rate
Total questions: 16
Worksheet time: 9mins
What is the correct order of electrical activity during a cardiac cycle?
AVN -> SAN -> Bundle of His -> Purkinje fibres
SAN -> AVN -> Bundle of His -> Purkinje fibres
AVN -> Purkinje fibres -> SAN -> Bundle of His
SAN -> Bundle of His -> AVN -> Purkinje fibres
The ____ acts as the heart's pacemaker.
AVN
Bundle of His
cardiac myogenic tissue
SAN
The wave of electrical activity in the sinoatrial node causes the ventricles to contract.
True
False
SAN activity immediately leads to... [select 2]
the atrioventricular valves opening
semilunar valve
atrial systole
atrial diastole
ventricular systole
Why doesn't the SAN send the entire heart contracting at the same time? [select 2]
The Purkinje fibres prevent the contraction of ventricular walls
Chambers that are not stretched are unable to contract
Non-conducting tissue prevents immediate contraction of ventricles
The AVN delays the impulse, allowing the ventricles to fill
The correct pathway of the conduction system of the heart is
SAN, Atrial diastole, AVN, Bundle of His, Purkinje fibres, Systolic diastole
AVN, SAN, Purkinje fibres, Bundle of His
AVN, Atrial systole, SAN, Bundle of His, Purkinje fibres, Systolic systole
SAN, Atrial systole, AVN, Bundle of His, Purkinje fibres, ventricular systole
Where is the SAN found?
(a)
1.atria contract
2. AV node
3. Bundle of His
4.Purkinje fibers
5. SA node
6. ventricles contract
About how much blood is in your body?
5 litres
10 litres
2 litres
20 litres
The "lub dub" sound is the sound of...
(a)
Which valve is located between the right atrium and the right ventricle?
Pulmonary valve
Aortic valve
Bicuspid valve
Tricuspid valve
What is structure 5?
Vena Cava
Aorta
Pulmonary Artery
Pulmonary Vein
What valve separates structure 3 and 4?
Pulmonary Semilunar Valve
Tricuspid Valve
Aortic Semilunar Valve
Bicuspid Valve
Smooth muscle is NOT found in...
arteries
arterioles
capillaries
veins
Where does an electrical impulse go after it leaves the Bundle of His?
SA node
aorta
AV node
Purkinje fibers
What type of arrhythmia is this ?
Normal
tachycardia
bradycardia
atrial fibrillation
