decrease in pH
Your afferent neurons send a message to your brain.
neurotransmitters
Your eyes send a message to your brain and then your brain sends a message back telling you what your seeing.
Brain
No.
0.000000001 seconds!!
The nervous system sends a message to your brain and your brain send a message back "telling you what to do". Sending a message to your brain and your brain sending one back takes a shorter time than it does for you to blink once.
The fingers send a message to the brain the way they feel the dots.
its send this message telling you to do the thing you wanted to do.
nerve tissue
Because all colors send a message to the brain. In this case red makes you irritated.
The vestibulocochlear nerve, or 8th cranial nerve.