In Myasthenia Gravis, my immune system has made some antibodies that have attached themselves to the receptors blocking them so the ACh can't come in and trigger the muscle to move.
There are literally millions of these receptors all over the body on the voluntary muscles. Having them blocked makes me weak.
|Myasthenia -- blocked receptors|
by antibodies from immune
system of the Rambler so muscle
contractions are weak
I found these images at a good basic website on myasthenia located at Myasthenia link