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Countercurrent Flow

by Greg Crowther


This is a brief musical tribute to one of the most beautiful physiological mechanisms of all time -- countercurrent flow -- which can be found in the far-flung examples listed in the lyrics below.


Flow, countercurrent flow.
Two streams side by side; they come and go.
The one takes from the other; a gradient makes it so.
Oh, countercurrent flow.

The gills of a fish; the loop of Henle of a mammal.
The tongue of a whale, and the nose of a camel.
Oh, oh, oh, oh,
Oh, countercurrent flow.

Other Files

karaoke (by Monty Harper)

MP3 (by Monty Harper)

music video

sheet music (with melody play-back)

Lesson Plan

Songs like this one can be used during class meetings and/or in homework assignments. Either way, the song will be most impactful if students DO something with it, as opposed to just listening.

An initial, simple follow-up activity could be to answer the study questions below. A more extensive interaction with the song might entail (A) learning to sing it, using the audio file and/or sheet music as a guide, or (B) designing kinesthetic movements ("dance moves") to embody it. The latter activity should begin with students identifying the most important or most challenging content of the song, and deciding how to illustrate that particular content.

Study Questions

(1) What is the definition of a countercurrent flow?

(2) What is the alternative to countercurrent flow?

(3) What is transferred via countercurrents in each example listed?

(Answers may be found on the answers page.)