In this diagram of G-protein-coupled receptor activation ... These activated subunits can act on ion channels in the cell membrane, as well as cellular enzymes and second messenger molecules ...

Mitochondrial genome contributes polypeptide subunits to the five enzyme complexes that comprise the oxidative phosphorylation (OXPHOS) system within the inner mitochondrial membrane, the site of ...

This takes place when molecules diffuse across the cell membrane by travelling through ... by the breakdown of ATP inside the cell. This diagram shows molecules moving from area of low ...

Living cells and tissues show a high capacity to absorb various chemical compounds from the surrounding environment. Although ...

The so-called T-tubule network within the cells, which consists of electrically excitable membrane tubes that are ...

For example, the long, narrow muscle cell is ... is a nucleus -- a sphere-like structure separated from the rest of the cell by a membrane. The nucleus acts as the cell's control center ...

A virus budding from a host cell membrane. This sequence of steps forms ... and how the virus is released from an organism (for example, through sneeze droplets or bodily fluids).

Environmental factors such as UV radiation or toxins can also damage the membrane. In plant cells, for example, intense light can severely stress and even damage the membranes in the chloroplasts ...

In living organisms, the membrane that encloses the cells is incredibly delicate and flexible. Many biological activities ...

The slideshow shows an example of osmosis showing the direction of movement of water between two different concentrations of sugar solutions. In pure water, the cell contents (the cytoplasm and ...

See COCHLEA for diagram. Incoming vibrations set up a travelling wave along the membrane giving it a different maximum displacement for different frequencies as shown below. The bulging of the ...

A diagram of a healthy macula ... it can cause a separation of the light-sensing photoreceptor cells from the retinal membrane. This separation prevents cells from receiving much-needed nutrients ...