no blood vessels · All Facts

no blood vessels
Your cornea has no blood vessels — it stays clear by taking oxygen from the air (via tears) and nutrients from the aqueous humor behind it.
SrcNCBI StatPearls — Cornea anatomy

Next evidence →no pain receptorsYour brain can't feel pain — it has no pain receptors. Surgeons can operate on the brain while the patient is awake.

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120 daysHealthy red blood cells circulate for up to about 120 days before the spleen and liver clear them.
red blood cellsThe spleen filters blood in its red pulp — trapping and recycling aging or damaged red blood cells.
2–3 million red blood cells every secondBone marrow releases about 2–3 million red blood cells every second into circulation.
hiccupsThe diaphragm is the main muscle of breathing — and sudden spasms of it cause hiccups.

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