Question

blood heomostasis is maintained in the body via three mechanisms:

Answer 1

Human body include mechanisms that help regulate the body, this includes organs, glands, tissues and cells. The adjusting of these enables the body to constantly be in a steady state.
The main mechanisms of homeostasis are body temperature, 
body fluid composition, 
blood sugar,
gas concentrations,
and blood pressure.

Answer 2

The main mechanisms of homeostasis are body temperature,  body fluid composition,  blood sugar,  gas concentrations,  and blood pressure.