Explain why muscles contract weekly or not at all when excessive levels of lactic acid and ADP have accumulated in the muscle and an excessive amount of K+ is lost in the muscle fibers

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )

the answer you are looking for is the united states forest service.

hope this !