homeostasis Flashcards
homeostasis is defined as …
maintenance of a constant and normal internal environment during UNSTRESSED conditions
what did Claude Bernard propose about homeostasis
that maintaining a constant internal environment is a requirement for the body to remain healthy
what is dynamic constancy
fluctuation up and down from the mean in the short term but stable over the long term
what is steady state
defined as a constant internal environment but not necessarily a normal at rest environment e.g. 39 degrees
what did the Morris et al 1999 study show
-in moderate temps, athletes reached steady state
-in hot temps athletes did not reach steady state
what generally happens if you don’t reach steady state or maintain homeostasis and example
you have to stop exercising because it’s dangerous e.g. Brownlee brother @ world traithlon series
how does the body maintain homeostasis
through control systems
how do most control systems work
via negative feedback which reverses the initial disturbance
what is the gain of a control system
the degree to which a control system maintains homeostasis
which control systems have large gains
pulmonary and cardiovascular systems
what are the components of a control system?
too much/little -> stimulus -> change of internal conditions -> SENSOR -> data to control center -> control center -> response to stimulus -> EFFECT -> negative feedback + return to normal -> homeostasis
control systems can maintain steady state during …
submaximal exercise in a cool environment
