MEDICAL PHYSIOLOGY

Detailed explanation-1: -Inside the axon terminal of a sending cell are many synaptic vesicles. These are membrane-bound spheres filled with neurotransmitter molecules. There is a small gap between the axon terminal of the presynaptic neuron and the membrane of the postsynaptic cell, and this gap is called the synaptic cleft.

Detailed explanation-2: -A synapse is a small area between two neurons where nerve impulses are transferred from axons of a presynaptic (sending) neuron to a dendrite of a postsynaptic (receiving) neuron through a neurotransmitter. It is termed the synaptic gap or synaptic cleft.

Detailed explanation-3: -Final answer: The gap between two neurons is called as synapse.

Detailed explanation-4: -Two neurons are never physically connected to each other and synapse is the gap between two neurons where information from one neuron is transmitted to the next one. The extracellular space between two neurons is known as synaptic cleft which makes option C true.