EXCRETION INTEGRATED SCIENCE 11DM. DEFINITION Excretion is the release of metabolic waste substances from the body. Metabolic waste are ingested substances.

Presentation on theme: "EXCRETION INTEGRATED SCIENCE 11DM. DEFINITION Excretion is the release of metabolic waste substances from the body. Metabolic waste are ingested substances."— Presentation transcript:

1 EXCRETION INTEGRATED SCIENCE 11DM

2 DEFINITION Excretion is the release of metabolic waste substances from the body. Metabolic waste are ingested substances that have been changed by the body (during chemical reactions) before it is released. Both plants and animals excrete.

3 Egestion is releasing faeces from the body through the anus. This is not excretion because substances in faeces were not made by chemical reactions in the body.

4 EXCRETORY PRODUCTS IN HUMANS 1.Carbon dioxide  from respiration 2.Water  from respiration 3.Nitrogenous compounds  from break-down of amino acids 4.Bile pigments  from haemoglobin break-down in the liver 5.Ions 6.Heat

5 ORGANS OF EXCRETION The excretory organs and substances they excrete are: 1.Lungs – carbon dioxide 2.Liver – bile, urea 3.Skin – sweat, heat 4.Kidney – urine, salts, excess water, urea

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7 LUNGS After respiration, the lungs excrete the carbon dioxide and water that are the by-products. This therefore utilizes breathing and gaseous exchange. Why are nitrogen and inert gases not said to be excreted?

8 LIVER The liver excretes excess proteins from the body by removing the nitrogen (NH) portion and then storing the carbohydrate portion. The nitrogen portion is converted to urea and is released in the sweat and urine. This is called deamination. The carbohydrate is stored as glycogen for later use.

9 SKIN The skin excretes salts, urea and water from the pores as sweat. Sweat glands are located in the dermis and then emerge at the surface of the epidermis as pores.

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14 URINARY SYSTEM

15 THE KIDNEYS AND URINARY SYSTEM

16 The urinary system is composed of 1.the kidneys which make urine 2.the ureters which are tubes (one from each kidney) that carries urine to the 3.bladder which temporarily stores urine until ready to leave the body through the 4.urethra in the penis or vagina.

17 The renal artery carries oxygen and nutrient rich blood to the kidneys The renal vein carry deoxygenated blood away from the kidneys to the heart.

18 Urinary Show Follow this link to the kidney show. LINK HOW THE KIDNEY WORKS http://www.youtube.com/watch?v=r7m5IyzQzAM&feature=fv w http://www.youtube.com/watch?v=r7m5IyzQzAM&feature=fv w

19 The kidney itself is composed of 1.the outer cortex 2.the inner medulla that pinches off into structures called 3.the pyramids that all point towards 4.the pelvis which is the upper region of 5.the ureter which carries urine from the kidney then to the bladder.