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.
Long-distance communication is by means of nerves and circulating hormones; the principal function of many organs, notably the endocrine glands, is to facilitate such communication between organs. Cells communicate with each other by means of an enormous diversity of signalling molecules.These molecules have traditionally been classified according to the distance over which they act. Local communication between neighbouring cells is described as paracrine signalling.ells communicate with each other by means of an enormous diversity of signalling molecules. These molecules have traditionally been classified according to the distance over which they act. Local communication between neighbouring cells is described as paracrine signalling.