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.
11. Neurotransmission occurs between the _____ _____ of one neuron and the _____ of another. 12. At the synapse, information is transmitted from one neuron to another via what kind of messengers? 13. An action potential is an _____ signal. 14. Why are chemical messengers, or neurotransmitters, needed to get information across the synapse? 15. What are ions? 16. Why are ions important for neurotransmission? 17. What are the 4 most common ions? 18. How do ions get across the neuron membrane?