Page 16 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Unicellular organism in the constant external environment of the primordial sea
Substance absorption
Primordial Signal reception and excretion
sea
Heat

Ion exchange
Genome
Digestion
Water Internal and External Environment
O 2
Exchange
Motility of gases
CO 2
Excretion
Plate 1.1
B. Maintenance of a stable internal environment in humans
Integration through
External signals nervous system
and hormones
O 2
CO 2
Emission of Exchange
heat Internal Behavior of gases
(water, salt) signals
Regulation

Lungs

Blood
Skin Extra-
cellular
Interstice space
Intracellular space

Uptake
of nutrients,
water, salts,
etc.
Kidney Distribution
Excretion
of excess
– water Waste and
– salts toxins Liver
– acids Digestive Excretion of 3 3
tract waste and toxins
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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