homeostasis Flashcards
Whats the defintion of Homeostasis?
Regulation of internal condition for optimum cell and enzyme function
Why is it important?
because conditions inside your body need to be kept steady even when external environment changes.
- cells need to be in the right condition to function properly
-right condition for enzyme action
What are the internal conditions that need to be regulated?
-Water levels
too much water = cells can burst
too less water = cells can shrink
-Blood glucose
too much glucose = circulatory problems
too less glucose = no respiration less energy
What are the internal conditions that need to be regulated?
- Temperature
too hot = enzyme denatures and active site changes shape
too cold = enzyme activity is too slow
What are the 2 automatic control systems that control homeostasis ?
- Nervous system
- Hormonal system
what are the automatic control systems all made up of?
Three main components
Receptor
coordination centre (brain,spinal cord,pancreas)
effector (muscle or gland)
Define negative feedback
Mechanism that maintains homeostasis
When level of smth is too low or too high,your body uses negative feedback to return it to normal
what are the three main components to negative feedback?
- Receptor
detect stimulus ( change in temp) is too low or too high - Co-ordination centre
receives, processes information and organises response - Effector
Produces a response which counteracts the change and restores the optimum level
What is the issue with the effector?
The effector will carry on producing the response as long as it is stimulated by the co-ordination centre. This could cause the opposite problem - making level change too much.
How is the issue resolved?
The receptor detects if level becomes too different and negative feedback starts again
This process is all …
automatic
