I know its kidneys but idk the second blank nothing makes sense
Small bean shaped organs called kidneys help clean the blood
Narcotics are also called opioid pain relievers. They are only used for pain that is severe and is not helped by other types of painkillers. When used carefully and under a health care provider's direct care, these drugs can be effective at reducing pain.
You need to sleep suck it up go to school you need your edumication
Answer:
True
Explanation:
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
More information so that way we can know what your talking about?
