i)+Excretion

Section 2- Structures and functions in living organisms a) Levels of organisation - b) Cell structure - c) Biological molecules - d) Movement of substances - e) Human Nutrition- e) Plant Nutrition - f) Respiration - g) Gas exchange (Humans) - g) Gas exchange (Plants) - h) Transport (Humans) -h) Transport (Plants) - i) Excretion - j) Coordination and response (Humans) - j) Coordination and response (Plants)

2i) Excretion

 * Learning outcomes (s//tudents will be assessed on their ability to)//**
 * 2.68 || recall that the lungs, kidneys and skin are organs of excretion ||
 * 2.69 || understand how the kidney carries out its roles of excretion and osmoregulation ||
 * 2.70 || describe the structure of the urinary system, including the kidneys, ureters, bladder and urethra ||
 * 2.71 || describe the structure of a nephron, to include Bowman’s capsule and glomerulus, convoluted tubules, loop of Henlé and collecting duct ||
 * 2.72 || describe ultrafiltration in the Bowman’s capsule and the composition of the glomerular filtrate ||
 * 2.73 || understand that water is reabsorbed into the blood from the collecting duct ||
 * 2.74 || understand that selective reabsorption of glucose occurs at the proximal convoluted tubule ||
 * 2.75 || describe the role of ADH in regulating the water content of the blood. ||
 * 2.76 || understand that urine contains water, urea and salts. ||

you have learnt about excretion in plants already! Can you think what substances plants excrete and how? Watch the click4biology video ([|download here]) below to clarify: media type="custom" key="23691576"
 * Starter**

Watch a helpful Brainpop movie on the urinary system why we have kidneys and what they do. This is helpful to put the kidney in context.

What colour should your urine be?

The new workbook can be previewed and downloaded below. media type="custom" key="27838563"
 * Lesson Preparation **

p83 - 90
 * Greenbook (Edexcel IGCSE Biology) References **


 * Tutorials **

Really good interactive tutorials from ABPI on all the aspects of the kidney you need to be aware of.

Video tutorials from [|C4B videos] addressing each outcome // N.B. due to syllabus changes the numbering and wording of some outcomes has changed since the videos were recorded. // 2.68 Human organs of excretion [|download] media type="custom" key="23691658"

2.69a Excretion [|download] media type="custom" key="23691676"

2.69b Osmoregulation [|download] media type="custom" key="23691704"

2.70 Structure of the urinary system [|download] media type="custom" key="23691740"

2.71 Describe the structure of a nephron [|download] media type="custom" key="23691736"

2.72 describe ultrafiltration [|download] media type="custom" key="23691734"

2.73 water is reabsorbed into the blood [|download] media type="custom" key="23691730"

2.74 selective reabsorption of glucose [|download] media type="custom" key="23691726"

2.75 describe the role of ADH [|download] media type="custom" key="23691724"

2.76 urine contains water, salts and urea [|download] media type="custom" key="23691720"

2.68 Human organs of excretion - test yourself on your knowledge of their layout using this drag and drop from TD flash zone media type="file" key="excretory_system_drag_and_drop.swf" width="800" height="450"

Useful animations from Kscience on the kidney and ADH media type="file" key="kidney.swf" width="640" height="480"

Controlling water in the body from s-cool covers kidney structure and function

This activity works in three phases. Phase one groups are decided and students learn about a chosen aspect of excretion. They prepare a part of a poster, under guidance and with help from the teacher, on this aspect. Phase two the students put their aspects together to create a single wall display and then spend 1-3 mins talking to the rest of their class about their aspect to set it into context. The last and final phase is note compilation students should now be ready to compile their notes and apply their knowledge with problem questions using the workbook resource (above).
 * Class poster activity**

__Phase one - the learning and poster creation__ Role of each group:
 * Get help from the different resources/teacher
 * Construct your part of the poster
 * Develop teaching notes – you will be talking to the class about your aspect of the class poster next lesson

Role of the teacher:
 * Run mini-tutorials for each group

Different groups:
 * 1) Overview of excretion (2.68, 2.69, 2.70, 2.76) [4 people max]
 * 2) Structure of a nephron (2.71) [3]
 * 3) Ultrafiltration (2.72) [2]
 * 4) Reabsorption of water (2.73) [2]
 * 5) Selective reabsorption of glucose (2.74) [2]
 * 6) Role of ADH (2.75) [2]

__Phase two - reflection and sharing__ Work with other groups to compile your wall display Each group takes turns to talk to the class about their aspect of the wall display. If you are listening, take notes - it will help you later on

__Phase three - individual note__ Individually complete your notes and questions in the workbook under guidance from your teacher.

Carry out a kidney dissection and record your findings. Use the guidance from Dynamic Science to help identify structures.
 * Practical activities**

Strange but True: Drinking Too Much Water Can Kill - An interesting article by Scientific American
 * Interesting extras**