Biomedical Engineering Reference
In-Depth Information
a
TABLE 6.8
Standard American Male
Age
30 years
Height
5 ft 8 in or 1.86 m
Weight
150 lb or 68 kg
19.5 ft
2
or 1.8 m
2
External surface
37.0
C
Normal body temperature
34
C
Normal mean skin temperature
0.86 cal/(g) (
C)
Heat capacity
Capacities
Body fat
10.2 kg or 15%
Subcutaneous fat layer
5 mm
Body fluids
ca.51 liters or 75%
Blood volume
5.0 liters (includes formed elements, primarily red cells, as well as plasma)
Hematrocrit
¼
0.43
Lungs
Total lung capacity
6.0 liters
Vital capacity
4.2 liters
Tidal volume
500 ml
Dead space
150 ml
90 m
2
Mass transfer area
Mass and energy balances at rest
72 kcal/h or 1730 kcal/day [40 kcal/(m
2
)(h)]
Energy conversion rate
O
2
consumption
250 ml/min (respiratory quotient
¼
0.8)
CO
2
production
200 ml/min
Heart rate
65/min
Cardiac output
5.01/min (rest)
3.0
þ
8
M
in general (
M
¼
O
2
consumption in liters per minute)
Systemic blood pressure
120/80 mmHg
a
From Lightfoot (1974).
Organs are comprised of functional subunits. Clear examples of such subunits include
the alveoli in the lung and the nephron in the kidney (Figure 6.22). These functional units
are comprised of a mixture of different kinds of cells that together constitute tissue function.
Separating the functional subunits into their individual cell components often leads to the
loss of tissue-specific function, but specific cell properties can be studied using such puri-
fied preparations.
