For example, sensory cells in the skin respond to the pressure ... detect changes in blood pressure — information that the body uses to maintain a consistent cardiac load. Cells have proteins ...

How these body-level asymmetries arise presents enduring mysteries ... It’s known that the ciliate Paramecium tends to spiral to the left as it swims, for example; neutrophil-like cells—a cell line ...

Cells in those parts of the body constantly use oxygen ... Look at the images below to see an example of how coffee particles diffuse in a cup of water. Air that is breathed in is around 21% ...

During infections, the immune system needs to distinguish foreign antigens that are expressed by invading bacteria and viruses from self-antigens that are expressed by cells of the body.