More juxtapositions

I have a soft spot for oddly juxtaposed teaching materials, e.g., a handout covering both lab-grown meat and the structure of the song “Hound Dog.”

Here are some strange bedfellows that appeared in animal physiology this spring and summer.

Above: two ways to convey the idea that most sodium ions (chemical symbol Na+) is outside cells rather than inside.

Above: Clostridium botulinum toxin, an inhibitor of the salt glands of marine birds … and the facial muscles of wealthy humans.

Above: In retrospect, this illustration of the importance of blood pressure regulation may have been too oblique.