1Excretion respiration feeding responsiveness growth reproduction is one of the characteristics of all living thingsfeedingrespirationreproductiongrowthresponsivenessmovementexcretionand
2Excretion Excretion is the removal of toxic chemical substances Toxic substances are poisonous and can harm the cells of the body if not removed
3ExcretionSkin - SweatKidneys-UrineLungs-Carbon Dioxide + Water
4Excretion from Kidneys urea, which is toxic, is produced in the liver from excess proteinToxic urea is removed by and carried by blood to the kidneyexcess protein from our food is carried from the gut by bloodliver
5Urea is filtered out of the blood mixed with water and excreted as Urine bladderurethrarenal veinrenal arterykidneyKidneysureterbladderurethra
6Kidneys bladder urethra renal artery carries blood to kidney renal vein carries blood from kidneykidney filters blood to remove ureaKidneysureter transports urine to bladderbladder stores urineurethra releases urine
83 the urine leaves the kidney in the ureter Blood1 blood containing water, salts and urea enters the kidney2 urea, some salts and water are removed from bloodstream by kidney and form urine3 the urine leaves the kidney in the uretersalturea
9Urine is stored in the bladder before being released from the body urethra
10Excretion from Lungs glucose cell oxygen carbon dioxide and water are waste products of the process of respiration in all the cells of the bodycellrespirationglucoseoxygenenergywatercarbon dioxide
11Excretion from Lungs glucose cell oxygen carbon dioxide and water are waste products of the process of respiration in all the cells of the bodyglucoseoxygenenergywatercarbon dioxidecellrespiration
12Excretion from Lungsthe carbon dioxide and some of the water is carried to the lungs by the blood to be excretedocoHocoH
13Excretion from LungsCarbonDioxideremovedSomeWaterremoved
14Excretion from SkinHuman skin has sweat glands which lead to pores at the surface – water, salt and a tiny amount of urea is excreted as sweat through these poressection of skinsweat glandblood capillariespore
15Excretion from SkinThe sweat evaporates taking in LATENT HEAT and so the body cools.section of skinsweat glandblood capillariespore
17One or Two?HINTHow many of each of the following are in the human urinary system?KidneyBladderRenal arteryRenal veinUreterUrethrabladderurethr
18Bladder structure and function urethrWhy is the bladder shaped like a plastic bag?Why is the bladder situated below the kidneys?There is a small circular muscle at the exit to the bladder. Why?
19ADCBKidney locationWhich answer places the kidney in the correct area of the body?ABCDB
20Kidney The kidney is usually covered in a layer of hard fat. Can you suggest a reason for this?
21KidneyAll the blood in the body is filtered by the kidney, but when it is cut open there is almost no blood visible. Can you think of a reason for this?
22Water - where and when?Water is released from the body by the lungs, the skin and the kidney at different rates under different conditions.How do you think each of the three excretory organs would react on a very hot day??
23Excretion - Summaryunderstand the structure and function of the urinary system: bladder, renal artery, renal vein, ureter, urethra and kidneyname the products of excretion: CO2, water and ureaunderstand the function of the skin in the excretion of waste products made in the bodyrecall that waste products are removed from the bloodstream by filtration in the kidneys in the form of urine, which contains urea, water and salts, and that urine is stored in the bladder before being released from the body