Yes, a PFO can be fixed using a non surgical procedure causing it to be closed and therefore fixing it.
Needs to be checked by a doctor.
You can't see them without a microscope, nor can you smell or taste them individually.
Answer:
Papillae are the little bumps on the top of your tongue that help grip food while your teeth are chewing. They also have another special job – they contain your taste buds, the things that help you taste everything from sour lemons to sweet peaches. Yummy!
Explanation: