An intricate three-dimensional network of blood vessels nourishes the heart.
A 3D model of the dengue virus reveals a shape like a soccer ball with an outer coating of glycoproteins.
Fat is made up of spherical plump cells supplied by a network of blood vessels.
A germ-spreading sneeze unleashes a shower of large liquid droplets and a moist gas cloud of smaller ones.
A freshwater snail infected with thousands of blood flukes will release the disease-causing parasites into the water where they can infect humans.
The measles virus can spread easily among people who have no immunity against it, as the current outbreak shows.
The muscles of the mouse’s heart contract about 600 times per minute, or a billion times in its three-year lifespan.
The surface cells of tadpole embryos have cilia that move the water around them.
Leaf-cutter ants practice fungus agriculture to provide the ant colony with a steady source of food.