Control of an internal environment Flashcards
What is homeostasis?
Maintenance of a constant and normal environment to ensure functional integrity
What is a positive and negative feedback loop?
- Response to increase
- Response to reduce an effect
What is gain? - give direction
The degree to which a control system can maintain homeostasis
- The higher the gain, the greater the control of homeostasis
What is adaptation?
The physiological changes of a cell which results in better control of homeostasis
What is acclimation?
The exposure to an environmental stress which leads to cellular adaptation
What is hormesis?
The exposure to a small-to-mod potentially harmful stress that leads to a beneficial adaptive response of a cell/organ
What is the gold standard criteria that marks VO2max has been reached?
Plateau in oxygen uptake against increasing work rate
What other factors can identify VO2max?
- RER above 1.15
- Achieving age predicted HR
- Reaching lactate threshold 0.8 mmol/L
What can be a better determination of performance than VO2max alone?
- VO2max and velocity
What is fractional utilisation?
The % of VO2max that can be sustained without fatiguing
What is lactate threshold?
The maximum intensity at which lactate accumulation and clearance are in equilibrium
