1. Neurons are the nervous system cells transmitting electromagnetic signals using action potentials and neurotransmitters.
2. Glia is the non-neuronal system cell keeping the neurons healthy and working.
3. Cerebrospinal Fluid or CSF is the fluid that ou...

Normally, veins return blood from the rest of your body to your heart. The veins in legs have to work against gravity

• Varicose veins- May be caused by weakened valves (incompetent valves) within the veins that allow blood to pool in your veins instead of traveling to your heart

Each muscle is made up of thousands of tiny muscle fibers. When you do body weight exercises, your muscles develop tiny tears in the fibers. When you rest, your body begins repairing your damaged muscle cells by fusing torn muscle fibers back together and laying down new proteins within each musc...