12-Osmoregulation[1]

12-Osmoregulation[1] - If I put a blood cell in a solution...

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If I put a blood cell in a solution that is hypertonic to the cell, what should happen to the cell? 1. The cell will shrink 2. The cell will stay the same size 3. The cell will expand
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Hypotonic, Isotonic, and Hypertonic (This figure shows what happens to cells placed in a solution of the given type)
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Welcome back! • Today we’ll continue with osmoregulation • Writing project 2 is due Wednesday in lecture – Turn in both a paper copy and an electronic copy (online in blackboard) – Writing project 3 is due May 14 (but requires work done before that date) • Lab exam is next Monday / Tuesday – Must be taken in the section you’re enrolled in
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Outline of osmoregulation unit 1. Osmosis and osmotic pressure 2. Metabolic wastes and their relation to osmoregulation 3. Animal examples of osmoregulation Freshwater (fish) Terrestrial (insects) Saltwater (fish) 4. Plant osmoregulation / water balance Water potential 5. Extreme xerophiles
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Blood cells are ~300 mOsm, with their primary osmolytes being proteins and potassium. If we put blood cells into a solution that is ~70 mOsm, with the primary osmolytes being sodium and chloride, what will happen? 1. The blood cells will shrink 2. The blood cells will stay the same size 3. The blood cells will expand
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What do organisms do when they get exposed to different osmolarities? • Osmoregulators – Tightly regulate their body osmolarity • Osmoconformers – Match their body osmolarity to the environment • Can be either active or passive
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Water balance • In animals, osmoregulation is often intertwined with excretion of wastes
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What types of metabolic wastes do organisms produce?
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Types of metabolic wastes
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Note: this is a general trend; there are multiple exceptions
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Homeostasis • Maintaining stable internal conditions while external conditions vary • The goal of most organisms with osmoregulation is to maintain homeostasis of their body water content
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Osmoregulatory challenges in various environments
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What are the osmolarities of various fluids? •F r e s h w a t e r – 20 – 40 mOsm/L • Normal (human) plasma osmolarity – 285 – 295 mOsm/Kg H 2 0 • Salt water (ocean) – 1010 mOsm/L • Human urine concentration – Varies from 50 – 1200 mOsm/kg H 2 O
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Discussion time! • One of the cool things about osmoregulation is that we can figure out what different organisms will have to do to maintain their water balance • So, let’s take some time and figure out: – How might a freshwater fish osmoregulate? – How might a saltwater fish osmoregulate? – What osmoregulatory challenges will a trerrestrial organism face? • Things to think about for each of these: – What are the relevant osmotic gradients? – What nitrogenous waste product will the organisms produce?
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12-Osmoregulation[1] - If I put a blood cell in a solution...

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