Physiology- Intro to Physiology and Homeostasis Flashcards
What is human physiology?
Study of the normal function of the body and the integrative mechanisms which control them at the level of:
- cells
- tissue
- organs
- body systems
- whole body
Tissue
a group of cells with a similar structure and a specialised function
body organs
a group of two/ more primary tissues which perform together to carry out a particular function
body system
a group of organs which performed related functions and work together to achieve a common goal
homeostasis
the maintenance of steady states within our bodies by coordinated physiological mechanisms
What must a control system be able to do in order to maintain homeostasis?
- sense deviation from normality
- integrate information
- make appropriate adjustments
Which two classes can homeostatic control systems be grouped into?
Intrinsic and extrinsic controls
Intrinsic control systems
Local controls which are inherent in an organ
Extrinsic control systems
Regulatory mechanisms initiated outside an organ, which are accomplished by nervous and endocrine systems
feedforward
response in anticipation of a change
usually acts in combination with negative feedback
feedback and the types of feedback systems
responses made after a change is detected
positive and negative feedback systems
positive feedback and example
amplifies initial change after it is detected
eg uterine contractions during labour become increasingly stronger until birth of baby
negative feedback and example
opposes initial change after it is detected
eg control of BP
which type of homeostatic control system is most common?
negative feedback system
components of the negative feedback system
sensor, control centre and effectors
