Is overload the act of exercising a muscle to fatigue

What is the principle whereby improvement occurs when increased demands are made upon the body

Ana is a hospital researcher. she wants to preserve organs for further study in a chemical that is called formalin. prior topreserving the organs, ana wants to familiarize herself with the hazards of using formalin. ana should consult formalin'sa. materials safety data sheet.b. date of expiration.c. date of manufacture,d. additional laboratory uses,

Acommon health myth is that people should drink at least eight glasses of water per day. while staying hydrated is important, why could this advice be inaccurate for different people? (site 1)