Professor Frank Baxter and some animated friends answer questions about blood. what makes it red? Why do little animals' hearts beat so quickly? And so much more.
Director:
Writer:
Frank Baxter
Himself
Richard Carlson
Mr. Fiction Writer
Mel Blanc
Squirrel / Turtle / Alligator / Rabbit (voice)
Sterling Holloway
Lab assistant
Marvin Miller
Hemo / Professor Anatomy
