homeostasis Flashcards
what are intrinsic controls
local controls that inherent in (INtrinsic) an organ
what extrinsic controls
regulatory mechanisms initiated outside an organ
- accomplished by nervous and endocrine system
what is feed forward control and give an example
a response made in anticipation of a change
- responding to cold weather by shivering (when thermoreceptors on the skin detect the cold, signals to the body are alerted of a possible fall in body temperature )
what is feed back control and give two examples
response made after change has been detected
- positive feedback systems
- negative feedback systems
what is a positive feedback system and give an example
amplifies an initial change
- uterine contraction during labour causes more contractions which helps to push the baby out
what is a negative feedback system and give an example
opposes an initial change
- main type of physiological control mechanisms
- when body temperature increases or decreases
what is homeostasis
the maintenance of steady states within our bodies by coordinated physiological mechanisms
- to survive and stay healthy, several variables within the internal environment of the human body must be tightly regulated within a NARROW RANGE
describe the process that would occur when your body temperature deviates from the norm
- sensors on the skin/in the body will detect the change from the narrow range that it should be within
- the sensors then sends this information to the control centre
- the control centre will also have other information from parts of the body that are relevant to the situation
- after taking in all of this information the control centre will then send a message to the effectors to bring about an appropriate adjustment ignorer to restore the temperature to its desired range
what type of things are regulated by negative feedback control
- mean arteriole blood pressure
- core body temperature
- blood glucose
- blood gases (arteriole PO2 and PCO2)
- blood H+ concentration (pH)
