The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
Did you know?
Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
Did you know?
Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
The Periodic Table (Part 1)
Part B: Classifying reproductive barriers
How to calculate annuity when compounded quarterly (Part 2)
How to convert verbal statements into algebraic equations (Part 2)