Here are three things you should know about your spleen: it filters blood and holds a reserve of red blood cells in case of emergency, it is an important part of your immune system, and it is connected directly to the brain through the vagus nerve.

Think of this organ—which is in the upper part of . . .

You have reached content available exclusively to Point Reyes Light digital subscribers.

Receive a 3-day free trial of unlimited digital access.

Already a subscriber? Login here.