Neurotransmitters is the word you're looking for.
A, as with all organisms, growth is always the primary result of cell division, the mitosis type, meiosis cell division results in gametes (sperm and eggs)
Irritable Bowel Syndrome or IBS for short is known to be a common disorder that affects the colon. IBS causes alternating patterns of constipation and diarrhea. In treating IBS, it requires dietary changes and some medications, especially antibiotics. Some known medications made for IBS patients are known as Lotronex and Amitiza.
Blood is constantly processed by some excretory organs even though it is not excreted by the excretory system.