How can you group paracrine, endocrine, and neurotransmitter into two groups?

If i understand your question correctly you would group paracrine with the endocrine system.

Paracrine signaling is a form of cell signaling in which the target cell is near ("para" = near) the signal-releasing cell.

Some signaling molecules degrade very quickly, limiting the scope of their effectiveness to the immediate surroundings. Others affect only nearby cells because they are taken up quickly, leaving few to travel further, or because their movement is hindered by the extracellular-matrix.

Examples

Growth factor and clotting factors are paracrine signaling agents. The local action of growth factor signaling plays an especially important role in the development of tissues. Also, retinoic acid, the active form of vitamin A, functions in a paracrine fashion to regulate gene expression during embryonic development in higher animals. In insects, Allatostatin controls growth though paracrine action on the corpora allata.

In mature organisms, paracrine signaling is involved in responses to allergens, tissue repair, the formation of scar tissue, and blood clotting.

Autocrine and endocrine actionsTestosterone secreted from the testes acts as an endocrine agent to stimulate peripheral events, such as muscle growth, and as a paracrine agent to stimulate spermatogenesis in the adjacent seminiferous tubules.

Histamine also serves as a paracrine

Well, endocrine is hormone related, neurotransmitters are brain/chemically related. Does that help? I'm not familiar with paracrine. Neurotransmitters are not classified with hormones, endocrine system and their chemicals are.

I am a Methodist and i surely recall myself a born once more Christian. So, no, they aren't two specific corporations. Christ is the top of the church, which includes all believers. I don't suppose a Lutheran or Catholic or non-denominational Christian is any much less of a follower than i am. God speaks to us every and we reply in our possess means. So long as you think Jesus Christ is your Lord and Savior, that's enough for me.

paracine and endo tohether.