What is Homeostasis? | Physiology | Biology | FuseSchool

[Music] so what is homeostasis homeostasis is a term first defined by Claude Bernard in 1865 it means maintaining a constant internal environment Wow great that really explains it doesn’t it let me try and make it a bit clearer that imagine the cockpit of a plane is tactful of dials and it is the pilots job to make sure they all stay in the right place if any of them change she will correct the planes keep them in the right place and the plane in the air this is a bit like how a brain works sensors all around the body for measuring various things and sending the information back to the brain the branding does its best to keep all these things stable and constant to keep the body working properly this is homeostasis maintaining a constant internal environment so what kind of things needs to be kept constant in the body well it’s very important to keep our temperature the same at around 37 degrees Celsius you can find out more about this in the video on temperature regulation you also need to keep the levels of sugar in the blood constant along with levels of ions and water your blood pressure needs to be carefully monitored along with the amounts of waste in the blood such as carbon dioxide and urea okay so let’s say one of these factors goes to high or low what is the brain going to do to get it back to the normal levels but also to that is negative feedback negative feedback is the process where the brain uses either hormone or nervous system to send a signal to the part of the body that can rectify the problem for example or to eat a meal your blood sugar level increases you can see it on the scroll this is detected and the pancreas will release a hormone called insulin that causes the sugar to be stored in the liver therefore as you can see on the graph the blood sugar level returns to normal negative feedback is to live from which the body detects of stimulus reacts by responding accordingly and brings the body back to the normal levels so why is homeostasis very important our metabolism which is all the chemical reactions in our bodies that keep us alive is controlled by enzymes these enzymes only working very specific conditions if these conditions change they could stop working and we could die luckily all this happens without you having to think about it if that’s the dirtiest laughter it’s been all day and not just trying to keep all these things constant and we’d have no time to do anything fun like watch videos of cats on the Internet [Music]


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