Heart Wave

Question 1

Sinoatrial (SA) node

Answer 1

Question 2

Anterior internodal

Answer 2

In the left atrium
-primary source of the transmission of signals from the sinoatrial node and the atrioventricular node.
-connect the other atrium and the cardiac muscles.

Question 3

Atrioventricular (AV) node

Answer 3

The point in the purkinje system where the impulse is temporarily DELAYED
-AV opens up in P wave (atrial systole) & T wave (ventricular diastole)
-Closes in QRS

Question 4

Middle internodal

Answer 4

In the left atrium
-primary source of the transmission of signals from the sinoatrial node and the atrioventricular node.
-connect the other atrium and the cardiac muscles.

Question 5

Posterior internodal

Answer 5

In the left atrium
-primary source of the transmission of signals from the sinoatrial node and the atrioventricular node.
-connect the other atrium and the cardiac muscles.

Question 6

Bachman’s bundle

Answer 6

conducts the impulse directly from the right atrium to the left atrium
-Opens in QRS

Question 7

Atrioventricular (AV) bundle (bundle of His)

Answer 7

to pace the heart contractions for the atrioventricular node and the ventricles

Question 8

Right and left bundle branches

Answer 8

The bundle of His divides into two bundle branches. The left bundle branch conducts impulses to the left ventricle, and the right bundle branch conducts impulses to the right ventricle

Question 9

Purkinje fibers

Answer 9

The Purkinje fibers have a fast inherent conduction rate, and the electrical impulse reaches all of the ventricular muscle cells
-In QRS! (ventricle systole)

Question 10

P Wave

Answer 10

Atrial systole = activation of the atria (the atria ejects blood into the ventricles)
-AV valves open
-SA node
-SL valves close

Question 11

QRS

Answer 11

Ventricular systole = activation in the ventricles
The period of contractions in the ventricles
-AV valves closed
-SL Valves open
-Purkinje fibers

Question 12

T Wave

Answer 12

Ventricular diastole = recovery wave
Determines left ventricular filling and stroke volume
-AV valves open
-SL valves closed

Question 13

What does blood pressure measure? (2)

Answer 13

1. The pressure of the blood on vessel wall
2. The pressure of volume in the vessel
   -Falls from aorta to right atrium
   Normal blood pressure 120/80mmhg

Question 14

Lub

Answer 14

1st sound
-Closure of the AV valves (tri & bi)
during ventricular systole

Question 15

Dub

Answer 15

2nd sound
-Closure of the semilunar valves (aortic & pulmonary) during ventricular diastole