As you age the following things take place in your skin: 1  The amount of collagen produced is diminished and the type of collagen changes from a more youthful type of collagen to an older type of collagen. The production of collagen never ends. 2  The Elastin in your skin decreases in content as well as production.
The definition of a synapse is the junction between two neurons or nerve cells where there is a small gap that neurotransmitters help nerve impulses to cross.
synaptic. pertaining to a synapse. synaptic cleft. a narrow space between the plasma membranes of the presynaptic and postsynaptic cells. synaptic junction. see synapse. synaptic vesicle. one located in the axon terminal of a presynaptic cell, containing neurotransmitter substances.ynaptic cleft, the microscopic extracellular space at the synapse that separates the membrane of the terminal nerve endings of a presynaptic neuron and the membrane of a postsynaptic cell. Nerve impulses are transmitted across this cleft by means of a neurotransmitter. Also called synaptic gap.