1

Aorta
2

Superior Vena Cava
3

Pulmonary artery (left lung)
4

Pulmonary artery (right lung)
5

Pulmonary veins (right lung)
6

Right atrium
7

Left atrium
8

Right ventricle
9

Left ventricle
10

Inferior vena cava (lower body)
11

Aorta (lower body)
12

Tricuspid valve
13

Pulmonic valve
14

Aortic valve
15

Mitral valve
16

Pulmonary veins (left lung)
17

Sinus node
18

AV node
19

Bundle of HIS
20

Purkinje fibers
21

Left and right bundle branch