Something called varicose veins will occur when the vein valves do not close. It doesn't happen all at once, but usually in various places in the lower legs. If it would happen in all the veins, then the return flow to the heart would be lower. A person would have to wear compression garments on legs and arms. The veins lower in the body are compressed by the muscles so there would not be a problem with them.
regurgitation
Blood will clot due the presence of platelets
the battery will stop working.
The cells might die off, leaving dead skin peel off in some places and the heart valves might stop working altogether
The valves in the blood vessels which control penis erection quit working with age.
Type your answer here... you will not live hey
There will be sparks and the device will stop working
No arteries have valves, only veins have valves to stop backflow.
Yes, there are.
Completely depends on the system. Often valves are designed to fail in a certain way (open/closed/as is) to prevent larger system failures. Need specifics of valve and application...
if that happens, then it would stop working.
Plants will be dead.Eventually animals also will be extinct.
if muscle cells stop working then we are not able to perform activites related to our muscle cells.
have your valves adjusted adjust your valves