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Learning Objectives: To know the role of the kidney

Homeostasis: The kidney. Learning Objectives: To know the role of the kidney To be able to label a diagram of the human excretory system To be able to label a section through the kidney and a nephron

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Learning Objectives: To know the role of the kidney

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  1. Homeostasis: The kidney Learning Objectives: To know the role of the kidney To be able to label a diagram of the human excretory system To be able to label a section through the kidney and a nephron To understand the role of ADH and interpret data about the presence of substances during the passage through the kidney

  2. What is the job of the urinary system? To regulate the volume and composition of body fluids, removing waste products from the body and expelling the waste and excess water from the body in the form of urine.

  3. The kidney Your kidneys remove the poisonous substances which your cells produce. Our bodies break down the protein in our food into amino acids. The diagram shows what happens to these amino acids: Some are used for growth and repair Some are not used – they are broken down in the liver

  4. The main poison your kidneys remove Urea is made in the liver from amino acids. Urea is a poisonous substance. Your kidneys remove it from your blood. They also remove excess salt (ions) from your blood. The urea and salts are dissolved in water to make a liquid called urine.

  5. Interesting facts • The kidneys filter about 1.3 litres of blood a minute. • All the body’s blood flows through the kidneys every 10 minutes, so blood is filtered 150 times a day.

  6. Excretory system The renal vein carries cleaned blood away from the kidneys The renal artery carries ‘dirty’ blood (with waste) into the kidneys The kidneys remove urea and other waste Ureters are tubes which carry urine to the bladder The bladder is a bag that stores urine The sphincter is a ring of muscle that keeps the bladder closed until you go to the toilet The urethra is a tube which carries urine out of your body

  7. Now see how much you remember… and click on his thoughts

  8. Medulla Renal artery The structure of the kidney Cortex Nephron within the kidney Renal vein Ureter Pelvis

  9. Now see how much you remember this time… and click on her thoughts

  10. The nephron Capillary knot Collecting duct Bowmans capsule Capillary network Tubule

  11. The nephron The diagram below shows a flattened section of the nephron ‘Dirty blood’ Capillary ‘Cleanedblood’ Useful substances are reabsorbed into the blood Urine goes to the bladder Urine(urea and water) Urine Useful substances Urine Bowman’s Capsule Tubule

  12. The liquid left in the nephron is urine. It contains urea and water and other unwanted substances. It then goes through the collecting duct and ureters to the bladder. The nephron The liquid in the nephron contains useful substances like glucose and vitamins. These are then absorbed back into the blood (reabsorbed). Blood is filtered through the capillary knot. Nearly all the blood except red cells filters through into the nephron ‘Dirty blood’ Capillary ‘Cleanedblood’ Useful substances are reabsorbed into the blood Urine goes to the bladder Urine(urea and water) Urine Useful substances Urine Bowman’s Capsule Tubule

  13. Postcard Complete the postcard to explain your journey through the excretory system. You are a water molecule travelling through the blood. Dear Celia the Ciliated Epithelial Cell, I have been on the most incredible journey! It all started when… Wish you were here… Celia Ciliated Epithelial Cells Front of Postcard Back of Postcard Urinary Tract

  14. Role of anti-diuretic hormone • If there is too little water in your blood then the body detects this and the pituitary gland produces anti-diuretichormone (ADH). • ADH increases the permeabilityof the tubules, and allows the kidneys toreabsorb more water, making a more concentrated urine. • The more ADH, the more concentrated the urine.

  15. The kidneys and water control Drag the boxes below to complete the table More ADH A little Yellow A lot Colourless Less ADH

  16. Kidney graphs Volume of urine (ml) Salt concentration (ml) Time after drinking (mins) Time after drinking (mins) ------ normal level

  17. Using the graphs answer the questions on the separate sheet

  18. Research Task Produce a leaflet for someone with a kidney problem, outlining the advantages and disadvantages of the use of dialysis or transplantation. Remember to use science to explain the procedures and remember to use more than 2 sources of information to improve the reliability. Kidney failure can be treated by dialysis or by replacing it with a healthy one by transplant from a donor

  19. What have we learnt? • To know the role of the kidney • To be able to label a diagram of the human excretory system • To be able to label a section through the kidney and a nephron • To understand the role of ADH and interpret data about the presence of substances during the passage through the kidney Learning outcomes

  20. Use Prezi to produce a concept map of your learning for this topic Click on the link to learn how to produce your own at home

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