Homeostasis

Balance within the bodys environment due to the many regulatory processes. The body can shift within a narrow range that is compatible with life eg blood glucose between 70-110 mg per 100.

When we exercise many regulatory systems need to manage the body such as breathing, heartrate, temperature control. These all affect each other, as increased oxygen is required the heart may beat faster and there may be a build up of heat causing sweating to cool us down.

Trained athletes constantly push themselves to the limit but attempt to avoid overtraining, when the demands we put on our body are too great then regulation is not controlled and we risk injury and illness.

Bodyfluids
as aspect of homeostasis is to control the volume and composition of fluid in and around cells in the body. When a fluid is inside a cell it is called intracellular if it is outside it is extracellular. If it is between cells it is interstitial and these fluids exist in the brain, eyes, joints, spinal column etc. Interstitial fluid is where most of the control occurs with the passing of nutrients and the removal of waste.

Control of Homeostasis
Disruptions can occur externally (sitting in the sun) or internally (blood sugar low from fasting) and can occur due to psychological reasons (stress from studying) and most of the time the body autocorrects but in some cases the imbalance is prolonged and dangerous such as from surgery or poisoning etc.

Generally the nervous (sending rapid nerve impulses) and endocrine (hormones slowly) systems work together to bring the body back into balance.

Feedback systems