Specialized Structures of the heart

Question 1

What do the specialized structures of the heart do?

Answer 1

iniate and/or conduct APs to depolorize myocytes which then produces myocardial contraction!

Question 2

What is the order of the specialized structures that the signal travels down?

Answer 2

1.Sinoatrial (SA) node
2.Atrioventricular (AV) node
3.Bundle of his
4.Purkinje fibers

Question 3

Sinoatrial (SA) node

Answer 3

-in the Right Atrium
-where the heart beat gets iniated via depolariation of atria

Question 4

What is the SA node nicknamed?

Answer 4

The “pacemaker” of the heart because it depolorizes at a regular rythem

Question 5

What innervates the SA node and what does that mean control wise?

Answer 5

The autonmoic nervous system innervates the SA node which means that the autonomic nervous system can control Heart rate

Question 6

Atrioventricular (AV) node

Answer 6

-in right atrium
-recieves depolorization signal from SA node and delays it to give the atria time to contract before sending it to the bundle of his

Question 7

Bundle of His

Answer 7

-located between L and R atria and ventricles
-gives rise to bundles branches and than relays signals to depolorize the purkinje fibers

Question 8

purkinje fibers

Answer 8

-innervate within myocardium R and L ventricles
-recieves signal to depolorize and stimulates both ventricles to contract