Search Results

This animation shows how the hormone epinephrine causes liver cells to secrete glucose without crossing their cell membrane.

This animation explains how glucocorticoid hormones influence nutrient metabolism by altering gene expression in cells.

This animation explains how an electrical signal (action potential) stimulating skeletal muscle triggers changes that enable muscle contraction.

This animation explains the difference between addition mutations, in which nucleotides are added to DNA sequences, and deletion mutations, in which nucleotides are lost.

For decades, the U.S. government issued a chemical shark repellent to pilots, sailors, and even astronauts to fend off potential shark attacks. The problem was, that substance did not actually work. This video explains why developing an…

This animation shows how the contraction and relaxation of the diaphragm leads to pressure changes in the alveoli of the lungs during inhalation (inspiration) and exhalation (expiration).

This animation summarizes the molecular structure of amino acids, peptides, and proteins.

This animation shows the different ways in which proteins are broken down and presented as antigens to the immune system.

People have turned to “vaping” with electronic cigarettes as an alternative to puffing on the real thing. But is the vapor they’re inhaling any safer than smoking a cigarette? This video examines what we know, and what we don’t know, about…

Are you breathing air molecules that were once exhaled by Caesar, Joan of Arc, or Madame Curie? Why did Albert Einstein try to break into the refrigerator business? In this video, writer Sam Kean, author of science books "Caesar’s Last…