Homeostasis Flashcards
Definition
A condition of equilibrium, or balance, in the body’s internal environment
Homeostasis
What is homeostasis maintained by?
The body’s regulatory processes
What 3 things are necessary for a control system to maintain homeostasis?
- detect deviations from normal
- integrate info with other relevant info
- make appropriate adjustments
Definition
Set point
the normal range for a given system
Definition:
Circadian Rythms
endogenous autonomous oscillators of physiological activites that result in an 24hr day/night cycle
What is the circadian clock system a major regulatory factor for?
nearly all physiological activities
Definition:
Local controls inherent to an organ
Intrinsic controls
Definition
Extrinsic controls
regulatory mechanisms intiatied outside an organ accomplished by the nervous and endocrine systems
How do we control homeostatis?
feedback loops and feedfoward loops
What is the difference between feedback and feedfoward loops?
Feedback: responses made after a change
feedfoward: responses made in anticipation of a change
What type of loop is it when a dog starts drooling when they see a treat?
feedfoward
What are the 3 components of a negative feedback loop?
Sensor
COntrol center
effector
Explain core temperature control.
Explain blood pressure control.
Explain glucose control.
Explain calcium control.
What type of feedback loop amplifies or reinforces an intial change?
positive
Positive feedback loop
Explain contractions during labour.
Definition
Disorder
general term for any derangment of abnormality of function
Definition
An illness characterized by a recognizable set of signs and symptoms
disease
What occurs to ones ability to restore homeostasis with age?
it declines
What do feedfoward loops attempt to do?
Anticipate changes
Explain the feedfoward mechanism for digestion.
- Saliva is produced prior to eating to prepare for the bvreakdown of carbohydrates
- In the digestive tract, secretion of insulin is increased to promote cellular uptake and storage of nutrients
Explain the feedfoward mechanism for exercise.
- regulation occurs through “Central Command”
- primes body for the changes that are about to take place during the exertion
- oxygen demand increases to working muscles
- cardiac output increase up to 6-7x
- oxygen extraction (oxygen pulled out of blood) rates can increase 2-3x (start breathing more)
Explain in detail the feedfoward loop for exercies.
Flow chart
