Messages in your brain are transmitted by

a) electrons
Ob) protons
Oc) photons
Od neurons

D) Neurons

Explanation:

Your nervous system contains millions of nerve cells, called neurons. Neurons are highly specialised to transmit messages from one part of your body to another. ... Motor neurons, which pass instructions from your central nervous system to other parts of your body, such as muscles or glands.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;