Why there is a need to take a break for exercise after a long hour of sitting?

Because if you don’t take breaks you’ll get tired very easily and your brain won’t work if it’s tired so it won’t be able to process anything you learn or read.

Ignoring a fellow nurse's dangerous treatment of a patient or inappropriate relationship with a patient

Answer(d) they all send signals from the brain to the body through long axons in the vertebral column;