Neurotransmitters transmit between , from neurons to glands, from neurons to organs, and from neurons to muscles.

1. Nerve impulse

2. Neurons

Explanation:

Neurotransmitters are compounds with low molecular weight. They are secreted by axon terminals of the neurons. The released neurotransmitters then bind to the receptors located on next neuron or on the surface of muscle cell.

The function of neurotransmitters is to carry the nerve impulse from presynaptic neuron to the postsynaptic neuron or from neurons to the effector organs such as muscles and glands.  

For example, neurotransmitters are released into the synaptic cleft to transmit the nerve impulse between neurons.