Generation

(G)

Number

(n)

Mean Diameter

[mm]

Length

[mm]

Volume

[ml]

Re

Trachea

0

1

18.00

120.00

30.54

1480

Main Bronchus

1

2

12.20

47.60

11.13

1092

Lobar Bronchus

2

4

8.30

19.00

4.11

803

3

8

5.60

7.60

1.50

595

Segmental Bronchus

4

16

4.50

12.70

3.23

370

Bronchi w/

5

32

3.50

10.70

3.29

238

Cartilage in Wall

6

64

2.80

9.00

3.55

149

7

128

2.30

7.60

4.04

91

8

256

1.96

6.40

4.94

53

9

512

1.54

5.40

5.15

34

10

1024

1.30

4.60

6.25

20

Terminal Bronchus

11

2048

1.09

3.90

7.45

12

Bronchiole w/ muscle in wall

12

4096

0.96

3.30

9.78

6.78

13

8192

0.82

2.70

11.68

3.97

14

16,384

0.74

2.30

16.21

2.20

15

32,768

0.66

2.00

22.42

1.23

Terminal Bronchiole

16

65,536

0.60

1.65

30.57

0.68

Respiratory Bronchiole

17

131,072

0.54

1.41

42.33

0.38

18

262,144

0.50

1.17

60.22

0.20

19

524,288

0.47

0.99

90.05

0.11

Alveolar Duct

20

1,048,576

0.45

0.83

138.42

0.056

21

2,097,152

0.43

0.70

213.18

0.030

22

4,194,304

0.41

0.59

326.72

0.015

Alveolar Sac

23

8,388,608

0.41

0.50

553.75

0.008

Alveoli. 21 Per duct

3E+0

0.E+2

0.E+3