The following CSS properties will be explained: 1  color. 2  background-color. 3  background-image.  background- 1 repeat. background-attachment.  background- 1 position. background.
The transmission of a signal through the nervous system can also be considered an example of long-distance signaling. Local signaling in plants is not well understood. Because of their cell walls, plants must have different mechanisms from animals. Plants and animals use hormones for long-distance signaling. In animals, specialized endocrine cells release hormones into the circulatory system, by which they travel to target cells in other parts of the body. Plant hormones, called growth regulators, may travel in vessels but more often travel from cell to cell or move through air by diffusion.
Endocrine signaling examples are insulin at its receptor on liver, muscle, & fat cells. Paracrine signaling examples are communication between alpha, beta, & delta cells in the islets of Langerhans in the pancreas (the endocrine pancreas). Autocrine signaling examples are less well known to most people. The classic examples are cytokine signaling in various cells of the immune system. ...Read more