What percent of your body weight does muscle make up?

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder

What is the most appropriate method of gaining weight (muscle mass)

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell