Cardiac Cycle

What part of the electrical conduction system is labelled A?

• SA Node

• AV Node

• AV Bundle

• Bundle Branches

• Purkinje Fibers

What part of the electrical conduction system is labelled D?

• SA Node

• AV Node

• AV Bundle

• Bundle Branches

• Purkinje Fibers

Which letter is representing the Purkinje fibers which are the final area of signal transmission before the ventricles completely contract?

• A

• B

• C

• D

• E

All of the following occur when the ventricles contract except

• the AV valves close
• blood is ejected into the aorta
• the semilunar valves open
• blood from the pulmonary trunk enters the atria

During atrial contraction and ventricular filling,

• the AV valves are open
• the semilunar valves are open
• the ventricles are contracted
• the atria are relaxed

What is the sequence of events in the transmission of an impulse through the heart muscle?
 a: AV node
 b: AV bundle
 c: SA node
 d: Through the atria
 e: Through the ventricles
 f: Bundle branches
 g: Purkinje fibers 

• d, b, a, c, f, g, e
  
  
• c, d, a, b, f, g, e
  
  
• b, a, d, c, f, g, e
  
  
• f, g, d, c, b, a, e
  
  

Order the phases an action potential travels in the conduction system

• SA node--> AV bundle branches--> AV node--> Purkinje fibers
• SA node--> AV node--> AV bundle branches-->  Purkinje fibers
• Av bundle branches--> AV node--> SA node--> Purkinje fibers
• Purkinje fibers--> SA node--> AV node--> AV bundle branches

The pacemaker of the heart is also known as the....

• AV node
• SA node
• Purkinje fibres
• Bundle of His

The 'Lub' sound of the heart is caused by .....

• Atrioventricular valves closing

• Semilunar valves closing

• Blood flowing through the Pulmonary artery and aorta

• Blood Flowing down into the ventricles

Which of the following is true about the semi-lunar valves in the heart?

• They are between atria and ventricles

• They close when pressure in the arteries is higher than pressure in the atria

• They prevent backflow of blood into the atria

• They open when pressure in the ventricles is higher than pressure in the arteries