One of the first things that most designers forget about CSS descendant selectors is that they are flexible. When CSS defines a descendant, it doesn't care whether the tag in question is the direct child, the grandchild, or some great-great-great-descendant of the initial element.
From the retina, visual information passes onto the bipolar cells and then to the optic nerve's ganglion cells. The optic nerve, which begins at the retina, is the sole visual pathway to the brain. Light information is conveyed as an electrical action potential through the neurons.
The purpose of the nervous system is to transfer information from the PNS to the CNS, process the information in the CNS, and send back information to the PNS. This transfer of information from the external environment, through neurons, and back again to the external environment is known as neuronal signaling.A summary of neuronal signaling: Before a neuron receives a signal, it is in a resting state Neurons receive signals in two forms: Chemical changes.This is done via neurotransmitters (see Synaptic Transmission below) or chemical elements in the environment (e.g., olfactory receptors) Physical changes.he purpose of the nervous system is to transfer information from the PNS to the CNS, process the information in the CNS, and send back information to the PNS. This transfer of information from the external environment, through neurons, and back again to the external environment is known as neuronal signaling.