Practical Work: Experiment to show capillary flow in the tail or fins of a fish
Capillaries are the smallest blood vessel which are formed by the divisions of arterioles. Fishes possess a rich network of capillaries under their skin.
Procedure: See the while setting up the experiment.
1. Place a thin wet wad of cotton on the bottom of a Petri dish towards one end.
2. Place a slide at the other end.
3. Remove a fish from the aquarium or jar of water and place it on the Petri dish such that its body lies over the wet cotton and its tail lies over the slide.
4. Place a thick wet wad of cotton over fish and place another slide over the tail. keep both cotton wads moist by putting water drops over these.
Experiment setup to show the capillary flow in fishtail
Source of Photo
5. Remove the clips from the stage of microscope and place the Petri dish on the stage so that the tail of fish is over the opening of stage.
6. Focus the microscope on tail and adjust the part of tail where blood capillaries are seen. Draw the structure of capillary network seen in tail of fish.
All data collected from my book of Science.