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Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium would remain after 4 minutes
Pineal Gland
A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep patterns.
Cerebral Aqueduct
A narrow channel located in the brain that connects the third ventricle to the fourth ventricle, allowing the flow of cerebrospinal fluid.
Interventricular Foramen
Openings that allow communication between the right and left ventricles of the heart, crucial for maintaining proper cardiac function.
Arachnoid Villi
Small protrusions of the arachnoid membrane into the dural sinuses allowing for the transfer of cerebrospinal fluid back into the bloodstream.
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