From Creatures Wikia
It is important to realize that organs in Creatures 3 are not defined in terms of what they are, but what they do. In turn, what they do is defined by the creature's genome. See the C3 Chemical List for information on chemicals involved. A fuller explanation of how organs are damaged is contained in the Biochemistry Set's documentation.
CNS: drive lobe support
Control involuntary actions, as well as a few "housekeeping" tasks like cancelling out hotness and coldness. Belladonna can interfere with them. In Norns they are attacked by antigens 3 and 4.
Controls breathing functions, of course. In Norns it is attacked by antigens 4 and 5.
Controls the production of loneliness, crowdedness, upatrophin and downatrophin. Creates pistle in the presence of urea, adrenaline when energy is low, hunger for protein when muscle tissue is low, and protease when apidose tissue is low or amino acid is high. This organ also produces sleepase when the creature is asleep or has decided to sleep. In Norns they are attacked by antigens 5 and 6.
Controls urination. In Norns it is attacked by antigens 0 and 7.
Skin cooling function
Helps creature regulate temperature. In Norns it is attacked by antigens 1 and 2. The clock rate is altered by fever toxin.
Controls aging, death by old age, death by low energy, death by low ATP, and death by wounds. Antigens cannot harm it, because if this organ were to be killed off, your creature would become virtually immortal :)
Only in females (and some male gay norns). Without a uterus a female cannot become pregnant, except via artificial insemination, and in this case she will not be able to lay the egg naturally. Heavy metals can injure it. In Norns it is attacked by antigens 0 and 1.
Controls general mating functions. In Norns it is attacked by antigens 2 and 3.
Fight or flight
This organ intensifies the effects of fear and anger in the presence of Adrenaline. In Norns it is attacked by antigens 3 and 4.
Constitutive drive maintenance
Turns drive backup chemicals back into normal chemicals. Belladonna can interfere with this organ. In Norns it is attacked by antigens 1 and 2.
Painly drive overwhelmsion
This strangely-named organ converts some drive chemicals into drive backup chemicals when the creature is in pain. In Norns it is attacked by antigens 0 and 1.
It converts pain itself into hunger for protein backup, (an apparent typo) and converts the following drives to their backup drives: hungers for starch and fat, coldness, hotness, tiredness, loneliness, crowdedness, boredom, sex drive.
Fearly drive overwhelmsion
This organ converts some drive chemicals (hungers, coldness, hotness, tiredness, boredom and sex drive) into drive backup chemicals when the creature is deathly afraid. In Norns it is attacked by antigens 2 and 3.
When a drive is too high, this organ produces the stress chemical. Antigens cannot harm this organ. Drives that produce stress in this way are:
- The three hungers
Produces antibodies for antigens. Oddly enough, this organ also causes many toxins to have their effects. Heavy metal poisioning can damage the immune system. In Norns it is attacked by antigens 4 and 5.
This organ produces prostaglandin when the norn is injured. Prostaglandin is used to help repair all other organs. Vitamin C helps this organ work faster. In Norns they are attacked by antigens 6 and 7.
This organ is responsable for changing the creature's gait in responce to certain drives and chemicals. It also emits Anabolic Steroid when the 'muscle energy' is used. This in turn is used to synthesis new muscle tissue. In Norns it is damaged by the presence of muscle toxin and lactate, and is attacked by antigens 0 and 7.