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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


  • 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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