Question

bio - 201l topic 6: nervous tissue, central and peripheral nervous system
practice it
lo 6.1. what is myelin?
a hormone that regulates the firing of neurons
a fatty substance that insulates neurons and speeds up their transmission of signals
a type of neurotransmitter that helps neurons communicate with each other
a protein that slows down the transmission of signals in neurons
a protein that helps muscles contract and relax

Explanation:

Myelin is a fatty - substance that forms a sheath around neurons. This myelin sheath acts as an insulator and increases the speed of nerve signal transmission. It is not a hormone, neurotransmitter, or a protein with the functions described in other options.

Answer:

A fatty substance that insulates neurons and speeds up their transmission of signals