Cardiac Cycle and Conduction

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

What is the sequence of events in the transmission of an impulse through the heart muscle?

• 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
  
  

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

• AV node

• SA node

• Purkinje fibres

• Bundle of His

The emptying of the atria (contraction) is controlled by the:

• SA node

• AV node

• Purkinje fibres

• Bundle of His

The AV node is located at...

• A

• B

• C

• D

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

Why are the walls of the left ventricle thicker than that of the right ventricle?

• The left ventricle must force blood into all the capillaries of the lungs 

• the left ventricle doesn't skip leg day

• This is false, the walls of the right ventricle are thicker

• Blood from the left ventricle is pumped throught the entire body 

What number represents the aorta?

• 1

• 2

• 3

• 4

• 8

which part of the brain controls heart rate/the SAN?

• hippocampus

• medulla oblongata

• amygdala

• ventral striatum

Tags

NGSS.HS-LS1-3

The _____ nerve decreases heart rate.

• accelerans

• vagus

• sino atrial

• atrio ventricular

Tags

NGSS.HS-LS1-3