Instancing Tutorial In 3ds Max By Aziz Khan
11-Now click on the (Birth 01(0-30 T:200) and increase the number of (Emit Stop) where you want to particle stop generating, like in the picture below.

12-Now click on Rotation 01 its by default (Random 3D) then change it to (Speed Space Follow) as in the picture below,

13-Ok right click on (Shape 01 (Tetra) and then do the same in image indicating below.

14-When you do this and now Pick the (None) button as like in the picture illustrating below.

15-And with (None) button still selected and then hit the arrow in the scene to instance particles with this arrow, as in the image below.

16-Now the (None) button changed to (Line02) and then decrees the (Scale % ) to something like 20 this is my setting you can give any value do you like. as picture below.

17-Ok Now click on (Display 01 (Ticks) and then change (Type) to (Geometry) as in the image down.

18-Now once for last time Right on (Speed 01 (along icon arrow) and then do the same as in the picture indicating down.

19-Now you will see a rectangular icon appears in the scene sometime its very small if yours do like this just scale and rotate it to fix where you want to put it. as in picture below.

20-Attach this newly created rectangular icon to motion path with line which we have created in the starting of this tutorial, when the rectangular icon moves the arrows will follow it nicely without any interpenetrating, as the image below.

Here is the final result render of mine this just to indication that how gas is moving inside pipe line, by doing this you can show blood cells how they behave inside the vein, and also by this method you can do endless creation you can never imagine.
The final render is below.

Hope this will help you to create something cool with your own pace, this tool is very powerful tool try something to be powerful and let me see how you talented.
Thanks your well-wisher Aziz Khan
If you have any comments, suggestions, feedbacks, and questions are welcome Please fell free to write me.