Muscular energy is the energy exerted by the human body on any object....it can be a push or pull ....the energy or power of the muscles is the muscular energy.
in your muscles
An example of muscular energy is when you use your leg muscles to pedal a bicycle. The muscles contract and generate energy to move the pedals and propel the bike forward.
muscular system
Glucose is used for energy in anaerobic systems related to muscular contraction.
ATP
yes
A example is dead animals
yes
to do work with or without the help of machines.
yes..obviously
When you press a key on a keyboard, your muscular energy is converted into mechanical energy to press the key down. The mechanical energy then triggers an electrical signal, which is converted into digital data by a processor in the computer. So, the main energy transformations are muscular to mechanical to electrical to digital.
I don't know what you mean by momentary muscular failure. Surely if this happens he won't succeed in lifting the barbell? Lifting a barbell or indeed any muscular work done involves chemical changes in the muscles which provide the energy required, in this case raising the weight against the force of gravity. The energy used to lift a weight m kg a height of h meters is 9.81 x m x h joules.