What is homeostasis?

Here's a start - much more in link.

The conditions inside the body must be controlled within narrow limits. This is called homeostasis. These conditions include water content, ion content, body temperature and blood glucose concentration.

The thermoregulatory centre is the part of the brain that monitors and controls body temperature. The pancreas meanwhile monitors and controls blood glucose concentration. It produces a hormone called insulin that reduces blood glucose levels

Homeostasis is the maintenance of a normal, constant internal environment

We need it for out body to function properly, maintaining different factors have their different purposes, for eg, maintaining our body temperature is so that body cells do not die and enzymes can function properly, all of these to ensure our body performs at its best

things that have to be controlled, very generically are blood substance concentration,pH, temperature

organs involved are many, brain, spinal cord, muscles, skin, liver, pancreas, kidneys

Homeostasis is a point of balance or internal equilibrium. All kinds of systems — both living and non-living — can work to keep themselves in this state of balance, but the word "homeostasis" is most often used in biology, particularly to describe how the human body reacts to changes and keeps itself within certain parameters to ensure that it can function correctly. These reactions include a range of responses, from the release of hormones to regulate internal imbalances to sweating to lower body temperature.