The Purkinje fibers are indicated by ________.

• A

• B

• C

• D

• E

The sinoatrial (SA) node is indicated by ________.

• A

• B

• C

• D

• E

The atrioventricular bundle (bundle of His) is represented by ________.

• A

• B

• C

• D

• E

The atrioventricular (AV) node is indicated by ________.

• A

• B

• C

• D

• E

The bundle branches are indicated by ________.

• A

• B

• C

• D

• E

The layer of the heart wall that receives the stimulus from letter E is called the ________.

• PERICARDIUM

• EPICARDIUM

• ENDOCARDIUM

• MYOCARDIUM

The partition where the bundle branches are located is called the ________.

• left atrioventricular groove

• interatrial septum

• interventricular septum

• right atrioventricular groove

The pointed, inferior portion of the heart, known as the ________, rests on the diaphragm and is oriented toward the left hip.

• base

• mediastinum

• apex

• pericardium

What is the muscular layer of the heart wall?

• epicardium

• myocardium

• fibrous pericardium

• endocardium

The two superior receiving chambers of the heart are known as the ________, while the two inferior discharging chambers of the heart are known as the ________.

• ventricles; atria

• atria; ventricles

• arteries; veins

• veins; arteries