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Transport Systems. Gas Exchange in other organisms Fish Gill Prac. Outline. Revision Quiz – Heart & Lungs Comparison of open and closed system Gas Exchange in Fish Fish Gill Prac. Revision Quiz. Do revision quiz – Heart & Lungs in Notes Link. COMPARSION OF OPEN AND CLOSED SYSTEM.

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transport systems

Transport Systems

Gas Exchange in other organisms

Fish Gill Prac

outline
Outline
  • Revision Quiz – Heart & Lungs
  • Comparison of open and closed system
  • Gas Exchange in Fish
  • Fish Gill Prac
revision quiz
Revision Quiz
  • Do revision quiz – Heart & Lungs in Notes Link
comparsion of open and closed system
COMPARSION OF OPEN AND CLOSED SYSTEM
  • Fill out the worksheet in the Notes Link
gas exchange in fish
GAS EXCHANGE IN FISH
  • UNLIKE TERRESTRIAL ORGANSIMS THOSE THAT LIVE IN WATER DO NOT HAVE A GREAT ACCESS TO OXYGEN
  • THE LEVEL OF OXYGEN IN WATER IS VERY LOW, DEPENDING ON THE TEMPERATURE, DEPTH AND WHETHER IT IS FRESH OR SALT WATER AFFECTS THE AMOUNT OF OXYGEN AVAILABLE
  • FISH HAVE DEVELOPED GILLS TO OVERCOME THIS PROBLEM
slide6

SIMPLEST GILLS ARE FOUND ON STARFISH

  • MOST COMPLEX GILLS ON FISH
  • GILLS VENTILATE WATER TWO WAYS
  • MOVING THE GILLS THROUGH THE WATER
  • OR MOVING WATER PAST THE GILLS
  • THE FIRST ONE IS ONLY PRACTICAL FOR SMALLER ORGANISMS
  • SO MOST FISH MOVE THE WATER THROUGH THEIR GILLS
fish breathing
FISH BREATHING
  • http://www.biotopics.co.uk/pot/animals/fishcy.html
gills
GILLS
  • FISH GILLS COMPOSED OF SEVERAL GILL ARCHES LOCATED ON EITHER OF THE PHARYNX
  • WATER DRAWN INTO PHARYNX VIA MOUTH THEN PUSHED BETWEEN GILL ARCHES BY COMPRESSING THE PHARYNX – MOUTH IS CLOSED
  • FOCES WATER BETWEEN INDIVDUAL GILL LAMELLE (LEAF LIKE STRUCTURES WHERE GAS EXCHANGE TAKES PLACE)
  • THEN PASSES OUT THROUGH OPERCULUM – COVERS AND PROTECTS FRAGILE GILLS
countercurrent flow
COUNTERCURRENT FLOW
  • FISH GILLS ALSO HAVE AN ADDITIONAL IMPORTANT FEATURE
  • COUNTERCURRENT FLOW – INCREASE AMOUNT OF OXYGEN EXTRACTED FROM WATER
  • BECAUSE THE BLOOD FLOW IN THE LAMELLAE IS THE OPPOSITE DIRECTION TO OXYGEN OF WATER
  • INCREASE EXTRACTION OF OXYGEN BY UP TO 80-90%
demonstration
Demonstration
  • COUNTERCURRENT FLOW
  • This is because the blood in the capillaries always encounter water that has greater concentration of oxygen. This creates a concentration gradient for a longer time so that oxygen can diffuse easily into the blood vessel from water.
fish gill prac
Fish Gill Prac
  • Safety Instructions:
  • Be careful of sharp implements
  • Wear gloves, safety glasses and lab coats to protect against foreign bodies
  • Prac instructions in Notes link
  • If can not do the prac look up answers in text book or internet
  • Fill out and hand in at end of lesson.
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