The heart in action  [film loop] 
produced by Halas and Batchelor Cartoon Films. 
 - Chicago :  Encyclopedia Britannica Educational Corporation,  nd. 
 - 1 film loop ;  8 mm. 
 - Human life series .
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heart--Physiology.