BBC - GCSE Bitesize Science - The urinary system : Revision, Page 4
Homeostasis is a state of balance inside the body, where the body systems work . /animation__micturition misjon.info Overview of Kidney Filtration Video. Maintaining a stable internal environment, or homeostasis, is essential. collecting . for the survival of In this animation, we look at the function of the mammalian kidney. . concentration difference between the filtrate and the. extracellular fluid . The kidneys and water balance is a nice topic to teach. External link the animation as a self-study activity once the topic of the kidneys and.
There has to be a balance between the amount of water gained from your diet though drinks and food and the water produced by cellular respiration and the amount of water lost by the body in sweating, evaporation, faeces and urine. This is achieved by the action of the hormone ADH anti-diuretic hormone.
How does it work?
Perhaps you have not drunk anything for a while or you have been sweating a lot. Part of the brain, the hypothalamus, detects that there is not enough water in the blood. The hypothalamus sends a message to the pituitary gland which releases ADH.
ADH and regulating water content – Higher tier
This travels in the blood to your kidneys and affects the tubules so more water is reabsorbed into your blood. As a result you make a smaller volume of more concentrated urine. The level of water in your blood increases until it is back to normal.
So, with these two kidneys right here, we're going to take in some blood, that will come in through our renal artery and come out at the end through our ureters right there to produce urine. So, that's sort of the overview look of what we're going to be doing here, and the reason why we do this is because there are cells in our body produce waste products or change up the acidity or the osmolality of our blood.
We've heard these terms before.
Homeostasis - kidneys | STEM
And it's very important for us to regulate what is the pH of our blood or how acidic it is or how many osmoles we have or things that dictate where ions or water flows.
And our kidneys make sure that that's at a set level. So going into the details, when blood comes into our kidneys, they enter through the renal artery, so I've got two renal arteries right here, one right there, one right there, and as you can see, it's going to go branch off and have a whole bunch of other networks that are going to be disseminated from here, and I'll talk a little more about that in a separate video.
But what happens is that we're going to have filtration of our blood, and from that filtrate that comes out, we're going to process it and reabsorb some ions and water. And as we reabsorb the things that are important, we are going to collect it into our renal vein. So here are two blue renal veins right here for each of our kidneys.
Our renal veins are going to take the returned or reabsorbed nutrients back into our blood and send it on its way. All right, very cool.
- Interactive resources for schools
- Homeostasis - kidneys
- Kidney Homeostasis - LouiseDaurio
So now we know sort of how the blood enters and leaves. Now, let's talk about the two main functions our kidneys are responsible. What are the two main functions that they need to carry out in order for us to filter our blood? So, the first function you probably guessed is filtration.
We take our blood and we filter it out, so we have all our waste products and some important molecules like ions or amino acids or glucose that end up in a filtrate that then passes through the kidneys.
So somethings in that filtrate, we want to get rid off, all the wasty stuff that we don't need, and so another or the second very important function of our kidneys is collection, and between these two jobs, the kidney will take our blood and put out some urine.
Now, at this point, I should also mention that there is a single functional unit, and so when we talk about our functions, there is a unit that we can talk about. The single smallest functional unit of a kidney is called the nephron, the nephron, and the nephron is responsible for filtration and collection.
We'll talk about some other structures in a minute that are only responsible for collection, but the nephron is charged with filtration and collection, so it's got two hats on.
And the nephron is sort of situated in two parts of the kidney. It also describes dialysis and kidney transplants. Students can use the animation as a self-study activity once the topic of the kidneys and their broad function has been introduced. Alternatively, it makes a good revision activity once the topic has been completed.
Depending on the detail required by your course specifications, students can be given a framework of headings so that they can focus onto the relevant sections of the animation. They could make their own notes on the topic, which will help them develop skills in interpreting and summarising information.
Supply diagrams for annotation. There is a good section on dialysis. Ask students to consider the dialysis solution and explain its composition. A kidney dissection is readily carried out in the laboratory.