Homeostasis the maintenance of a constant or unchanging internal environment during rest or unstressed conditions

Steady State constant internal environment or metabolism during exercise or elevated metabolism balance has been achieved between demands of the body and the body’s response

Changes in body core temperature during exercise in thermoneutral environment

Temperature core temperature is a very important metabolic parameter needs to be maintained within a very narrow range much heat is generated during exercise, but is dissipated to maintain constancy homeostatic condition will not differ from steady state greatly

Changes in arterial blood pressure across time during rest

Blood Pressure blood pressure is another important metabolic parameter will vary to a greater extent from rest to exercise will be constant during homeostasis or steady state though

A thermostat controlled heating/cooling system

Components that comprise a biological control system

Components Stimulus-excites a receptor Receptor-receives the stimulus Integrating center-relay station (dispatcher) Effector-corrects disturbance and removes stimulus

Negative Feedback Biological control system effector response opposite to stimulus very common in biological systems

Example of negative feedback mechanism to lower blood pressure

Regulation of blood glucose concentration

Exercise as a Test of Homeostasis During exercise Heart rate can increase 4-5 fold Systolic BP can increase 2-3 fold Core temperature remains relatively constant Blood glucose remains stable for prolonged periods Body possesses wide range of homeostatic mechanisms which counteract physiological stressors