1 / 14

Transport Systems

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.

malana
Download Presentation

Transport Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Transport Systems Gas Exchange in other organisms Fish Gill Prac

  2. Outline • Revision Quiz – Heart & Lungs • Comparison of open and closed system • Gas Exchange in Fish • Fish Gill Prac

  3. Revision Quiz • Do revision quiz – Heart & Lungs in Notes Link

  4. COMPARSION OF OPEN AND CLOSED SYSTEM • Fill out the worksheet in the Notes Link

  5. 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

  6. 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

  7. FISH BREATHING • http://www.biotopics.co.uk/pot/animals/fishcy.html

  8. 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

  9. GILLS

  10. 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%

  11. COUNTERCURRENT FLOW

  12. 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.

  13. 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.

More Related