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OSMOREGULATION

OSMOREGULATION. Prepared By: Ms. Andrea Veira 19 th February, 2011. http://scienceblogs.com/clock/upload/2006/06/kidney-nephron.jpg. Osmoregulation. Control of body fluids and tissue fluids. Control of water and salts in body. Important to prevent cells from bursting or drying out.

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OSMOREGULATION

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  1. OSMOREGULATION Prepared By: Ms. Andrea Veira 19th February, 2011. http://scienceblogs.com/clock/upload/2006/06/kidney-nephron.jpg

  2. Osmoregulation • Control of body fluids and tissue fluids. • Control of water and salts in body. • Important to prevent cells from bursting or drying out. • Linked to Excretion and Homeostasis. http://www.moviegoods.com/Assets/product_images/1010/268783.1010.A.jpg

  3. What Is Responsible For Osmoregulation? • Kidneys- they control the amount of water and salts reabsorbed. • Hypothalamus- monitors concentration of blood • Pituitary Gland- secretes ADH into blood

  4. What is ADH? • Anti-Diuretic Hormone • Made in the hypothalamus • Released by the pituitary gland • Prevents production of dilute urine • Stimulates parts of nephron to reabsorb water • Opposite to a diuretic hormone http://barttersite.org/imgs/kidtut4.gif

  5. ADH And The Kidney http://www.indiana.edu/~phys215/lecture/lecnotes/renal/ADH.gif

  6. How Does Osmoregulation Work? • Blood passes to the hypothalamus in the brain. • The hypothalamus monitors the concentration of the blood. • If the concentration is low, it means the person ingests too much salt or drinks too little water. • Hypothalamus sends message to pituitary gland to secrete ADH into blood.

  7. ADH Is Secreted-What Next? • The ADH stimulates the walls of the distal convoluted tubules and the collecting ducts to reabsorb most of the water from the filtrate. • Small amounts of urine are produced http://www.medgadget.com/archives/img/urine_cup.jpg

  8. Flow Chart http://www.occc.edu/biologylabs/Images/Homeostasis%20Images/Fluid_copy.JPG

  9. The Opposite Scenario • The hypothalamus detects that blood is too dilute (the person is drinking large volumes of water, sweating little and low salt intake in diet). • No ADH is released

  10. No ADH Secreted Means: • Little water absorbed (walls not stimulated as much) • Large amount of dilute urine. http://www.play-with-water.ch/d4/experiments/images/img_89.jpg

  11. Osmoregulation In Plants • Plants also need to osmoregulate in order to maintain turgidity. • How do they osmoregulate? They have different adaptations to their environment to control their water and salt levels. Can you remember what these special plants are?

  12. Special Plants • Xerophytes • Hydrophytes • Mesophytes • Halophytes http://cdn.wn.com/pd/6f/6b/3aeb2868ec700aa051f5f50ec1f9_grande.jpg http://www.western.edu/faculty/jsowell/desertecology/cardon.jpg/image_preview http://anubis.ru.ac.za/Main/Adaptations/w-lilly1.jpg http://www.xray-mag.com/files/Mangroves_0.jpg

  13. Links • http://www.biologyreference.com/Oc-Ph/Osmoregulation.html • http://www.biotopics.co.uk/human2/homkid.html • http://www.jstor.org/pss/3884521

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