Describe the process of nociception using the four phases of

Nociception can be described as a response to harmful or potentially harmful stimuli (chemical, mechanical, thermal).  It includes four stages:

1.Transduction or  first phase: A noxious stimulus occurs (injury, burn, incision) and it is transformed into a electrical signal that can be carried via transmission.

2. Transmission or the 2nd phase: the pain signal travels to the central nervous system, first to  the spinal cord than to the brain.  

3. Perception or the 3rd phase: occurs in the cerebral cortex where the perception of pain is generated (the conscious awareness of a painful sensation).

4. Modulation-last phase: pain message is usually inhibited through this phase.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.