fbpx

โš–๏ธ The principles and importance of homeostasis

The internal environment of our bodies is constantly kept within strict limits. Take for example temperature. It must be a challenge keeping our fleshy selves at 37ยฐC while the outside fluctuates wildly! Or how about blood glucose concentration? Weโ€™ve all heard of diabetes โ€“ if it goes too high our organs sustain damage, if it goes too low a coma may be induced or even death.

 

Welcome to homeostasis โ€“ the maintenance of physiological parameters within optimal range. Other parameters include blood pressure and pH.

 

Negative feedback and thermoregulation

 

The operation of an oven is an easy example of negative feedback acting both ways, which is how it usually acts. That means that there are deviations in two opposing directions. If an oven is set at 220ยฐC, both a decrease and an increase in temperature is a deviation. So if the temperature drops or rises, a sensor picks that up and commands the heater to turn on or off.

 

This is negative feedback because it returns the system to its…

๐Ÿ† Read 500+ topics for all 6 UK exam boards ๐Ÿ†

๐Ÿ“ Enter now to claim your FREE 3-day trial and find answers to all your revision topicsย ๐Ÿ“
โœ”๏ธ Just ยฃ3.49/month after thatย โœ”๏ธ Scholarships & teacher plans availableย โœ”๏ธย Cancel anytime

You explain everything so simply!ย ๐Ÿ™‚ย -SecretDuck on The Student Room
Just a huge thank you for spending your time helping others. I love your site and Iโ€™m seriously very grateful. No word of a lie -Neuron13 on The Student Room
Thank you for making all the content btw!ย -Serena Kutty on YouTube
Good topic notes and cool videos. Iโ€™ll definitely recommend it to my students.ย -Seema Sehgal (AQA Examiner and Biology Teacher) on LinkedIn