Keeping your muscles healthy will help you to be able to walk, run, jump, lift things, play sports, and do all the other things you love to do. Boys and girls have similar amounts of muscle until about the age of 10, after which puberty increases testosterone levels in men and drives a much greater expansion of skeletal muscle. Muscle mass decreases approximately 3–8% per … [Read more...]
Skeletal Muscles: How Do They Work?
Muscles contract and relax to allow the body to perform crucial activity. Electrical signals tell the muscle when to contract, but when the muscle needs to relax, the signal is deliberately ignored. Until now scientists have been unable to understand how the body ignores this signal. Muscle is an organ specializing in the transformation of chemical energy into movement. … [Read more...]
