Why does the body maintain a internal environment by homeostasis?

Answer 1

The body as a whole maintains an equilibrium scientists call homeostasis by alternating stimulation of the sympathetic and parasympathetic branches of the nervous system respectively. The sympathetic nervous system stimulates receptors with epinephrine, norepinephrine and other hormones involved in raising your bodies alertness. When this is fully stimulated in times of stress or fear, heart rate, blood pressure and respiration's are increased and blood flow to the unneeded organ systems is redirected to the heart brain and lungs your pupils will dilate and attentiveness increases. The parasympathetic system calms you back down again to resume homeostasis the balance of these two on a regular basis is essential. Each individual system of the body needs maintained temperature, pace, volumes, etc... homeostasis in the digestive tract for example, includes correct amount of blood flow, bile production and energy reserves. Without the perfect balance of these aspects we wouldn't be able to digest food properly and therefore would not be able to gain or reserve any energy or nutrients which would result in death. Each body system is an important part of our existence and ability to live. Each body system needs a balance of resources from the body to do its job properly and maintain life. That is why homeostasis is maintained by the body .