AP BIOLOGY

Detailed explanation-1: -One unique example of paracrine signaling is synaptic signaling, in which nerve cells transmit signals. This process is named for the synapse, the junction between two nerve cells where signal transmission occurs.

Detailed explanation-2: -Synaptic signaling only occurs between cells with the synapse; for example between a neuron and the muscle that is controlled by neural activity. Signaling by cell contact must have cells with adjacent plasma membranes.

Detailed explanation-3: -Synapses are part of the circuit that connects sensory organs, like those that detect pain or touch, in the peripheral nervous system to the brain. Synapses connect neurons in the brain to neurons in the rest of the body and from those neurons to the muscles.

Detailed explanation-4: -Synapses are the structural basis of communication between neurons in the central nervous system (CNS) and between neurons and muscle cells in the peripheral nervous system (PNS). Synapse development involves the formation of a contact between axon terminals and specific sites on the appropriate target.

Detailed explanation-5: -Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical. Most synapses are chemical. That means that an electrical impulse-or action potential-spurs the release of chemical messengers.