Since 1999, Nissan has been part of the RenaultâNissan Alliance, a partnership between Nissan and French automaker Renault. As of 2013, Renault holds a 43.4% voting stake in Nissan, while Nissan holds a 15% non-voting stake in Renault. Carlos Ghosn serves as CEO of both companies.
Figure 1: Calcium homeostasis is a process controlled by chiefly by hormones vitamin D and PTH. Vitamin D enters circulation via synthesis in the skin or intestinal absorption and is subsequently converted to its active form, 1,25(OH) 2 D via separate hydroxylation processes in the liver and kidneys.
By Regina Bailey. Definition: Homeostasis is the ability to maintain a constant internal environment in response to environmental changes.It is a unifying principle of biology. The nervous and endocrine systems control homeostasis in the body through feedback mechanisms involving various organs and organ systems.y Regina Bailey. Definition: Homeostasis is the ability to maintain a constant internal environment in response to environmental changes.