Formative Heart labeling, blood flow, & conduction

Which of the following structures are considered the heart's natural pacemaker?

• Atrioventricular (AV) Node

• Bundle of His

• Purkinjie Fibers

• Sinoatrial (SA) Node

Reorder the following as the electrical conduction goes through the heart

• Bundle of His

• Right and Left Bundle Branches

• Purkinjie Fibers

• Atrioventricular (AV) Node

• Sinoatrial Node

Reorder the following as the blood flows through the heart to the lungs

• pulmonary artery

• pulmonary/semilunar valve

• right ventricle

• tricuspid valve

• right atrium

Reorder the following as the blood flows through the blood vessels

• venules

• veins

• capillaries

• arterioles

• arteries

What represents 10?

d

aorta

inferior vena cava

pulmonary artery

right ventricle

What represents 4?

a

aorta

left ventricle

right atrium

right ventricle

What represents 7?

c

right atrium

right ventricle

left atrium

left ventricle

The double-layered sac that the heart sits in is called the ​ (a)   . The muscle or the middle layer of the heart is the ​ (b)   . The smooth layer that lines the innermost of the heart is called the ​ (c)   . ​

• endocardium
• pericardium
• myocardium