Cardiac cycle and conduction

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 definition of the Cardiac Cycle?

• the contraction of the atria
• the sequence of events that occur during one complete heartbeat
• the contraction and relaxation of the ventricles
• the circulation of blood in the heart

The QRS-wave correlates with which event?

• atrium contraction /signals moving from SA node to AV node
• ventricle depolarization and contraction
• ventricle repolarization
• both atrial and ventricle contraction

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 role of the atrioventricular node (AV node) is to

• initiate a sinus rhythm
• conduct impulses to the sinoatrial node (SA node)
• initiate ventricular depolarization
• slow down impulses so that the atria can fill with blood

If the heart is beating too fast, it might be indicative of this condition: 

• Brachycardia
• Tachycardia
• Congestive Heart Failure
• Heart Murmurs

Heart rate less than 60 beats per min.

• Congestive heart failure (CHF)
• Heart murmurs
• Bradycardia
• Tachycardia

Tags

NGSS.HS-LS1-3

During which phase of the cardiac cycle do the ventricles contract?

• atrial systole
• ventricular systole
• ventricular diastole