The various implants function as described below (and, yes, we all know what they do...
):
Phase 1 - Secondary HeartThe most self-sufficient of the Implants, the secondary heart serves a number of functions. Ultimately it allows the Marine to suffer increased levels of trauma and to operate un-impaired in deoxygenated environments. It also ameliorates the tendency for myocardial infarction brought about as a result of the operation of the Ossmodula (q.v.).
Phase 2 - OssmodulaA small tubular organ implanted into the body altering the affect of the pituitary gland and the release of growth hormone, delaying epiphyseal fusion and increasing rates and duration of intramembranous and endochondral ossification. Introduced dietary bio-nanites lace or sheath the bone with titanium alloys. The overall effect is to create a greatly enhanced physique much larger than the human norm.
Phase 3 - BiscopeaThe Biscopea stimulates the rate and duration of skeletal muscle growth.
Phase 4 - HaemastamenThe Haemestamen is implanted into the carotid artery and serves two purposes: (1) it controls the functioning of Phase 2-3 implants, and (2) increases the efficiency of the blood.
Phase 5 - Larraman's OrganThis organ is implanted into the thorax near, and attached to, the left and right atria of the primary heart. It serves to increase the number of platelets within the blood stream, thereby cause rapid sealing of a wound to the external environment. Unfortunately, this also requires that the implantee takes anticoagulants to prevent thrombosis (once per day; failed HT causes cardiac arrhythmia/infarction).
Phase 6 - Catalepsean NodeThis implant is inserted into the brain in an excavated portion of the endocranial surface of the occipital bone. The organ influences the circadian rhythms and the body's response to sleep deprivation. The implantee is capable of sleeping while simultaneously remaining conscious by 'closing down' areas of the brain sequentially. This does not replace normal sleep.
Phase 7 - PreomnorThis is large implant into the thorax, forming a pre-digestive stomach and allowing the implantee to process otherwise poisonous or indigestible material. No digestion occurs in the preomnor.
Phase 8 - OmaphageaA complicated implant that is associated with the brain and nervous system. Four nerve sheaths (neuroclea) are implanted between the spine and the preomnoral stomach wall. It is designed to absorb genetic material stored in animal neural tissue. Thus, the implantee can learn by eating. It is this organ that has created the various flesh and blood drinking rituals for which the Adeptus Astartes are notorious.
Phase 9 - Multi-LungA large implant, the multi-lung (or 'third lung') is a tubular grey organ attached to the trachea via a sphincter and 'sub-trachea.' It is also linked to the preomnor to deal with toxins (associated with increased gas production!). In toxic or deoyxgenated environments a sphincter in the trachea closes and the sub-trachea is opened allowing continued breathing.
Phase 10 - OcculobeLocated near the omaphagea, it is primarily a hormonal gland that allows subsequent stimulation of the eyes and optic nerves.
Phase 11 - Lyman's EarThis allows the implantee to consciously enhance and filter certain types of background noise. This also improves the implantee's response to disorientation.
Phase 12 - Sus-an MembraneThis flat organ is implanted over the superior surface of the brain, growing into the tissue until it has merged. With subsequent chemical therapy the organ activates and, in certain environmental situations (extra trauma, lack of oxygen, etc.), will force the body of the implantee into a state suspended animation.
Phase 13 - MelanchromeThe melanchromic organ is black and hemispherical, acting to monitor local radiation levels interacting with the skin. If such levels are considered 'high' the melanchrome initiates a melanin reaction to darken the skin and protect it from UV radiation. Released chemicals also protect against limited radiation.
Phase 14 - Oolitic KidneyThis red-brown and heart-shaped organ modifies the implantees circulatory system. It primarily filters blood more efficiently than a normal kidney and, operating with the secondary heart, allows toxins that are not deal with by the multi-lung and preomnor to be rapidly pushed out of the system. During such detoxification periods the implantee is rendered unconscious.
Designer's Note: Very munchkin, but what the heck...Phase 15 - NeuroglottisThis implant is inserted into the posterior throat and essentially acts as a chemical sniffer. The implantee can detect by taste - and, to a lesser extent, smell - natural poisons. Furthermore, in an atmosphere it is possible for the implantee to follow an individual by their scent!
Phase 16 - MucranoidThis implant modifies the sweat glands, but requires chemo-therapy to fully activate. As a result of these conditions the implantee can sweat an viscous oil which coats the skin. This has the effect of protecting the implantee against extremes of temperature and, to a lesser degree, from vacuum.
Phase 17 - Betcher's GlandThis 'gland' is actually two organs implanted into either the lower lip, alongside the mesial salivary glands, or into the inferior surface of the palate. It functions to synthesise and store an acidic/corrosive contact poison that can be expelled in a liquid jet upon demand.
Phase 18 - ProgenoidsThe progenoids are two glands, one implanted into the neck and thorax, which serve to store specific genetic information for the zygotes. That is, they store the geneseed of the Adeptus Astartes Chapter responsible for implantation. These organs mature over time: the neck gland matures after 5 years, and the thorax gland after 10 years. The implants may be removed anytime after maturation.
Phase 19 - CarapaceA bioplastic that is implanted underneath the skin of the recipient. Upon implantation the carapace hardens and sends communicative fibrils into the central nervous system. The carapace itself becomes mobile under electric (neural) interaction, with the ultimate effect that it does not cause any reduction in the mobility of the implantee. Furthermore, the carapace also contains a number of neural jack interface ports which allow direct communication with 'jacked' powered armour and equipment.