Ross strains his calf muscle at the gym. at home, he massages the muscle. doing so not only decreases swelling, but it also closes the pain gates from the by stimulating fibers.

but it also closes the pain gates from the bottom up by stimulating large myelin fibers.

Stimulation of non-nociceptor by rubbing the skin will activate bottom up gating mechanism. This stimulation will inhibit the firing of the nociceptor that responsible for the pain.

A) 4 amusingb)alpha particle is a helium nucleus. it contains 2 protons and 2 neutrons.c)alpha particle has charge of +2.