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Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

If you could remove all of your skin, it would weigh up to 5 pounds.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Ventilation of the mammalian lung by negative pressure filling. Ventilation of the mammalian lung by negative pressure filling.
Crystallized negative stain salts Crystallized negative stain salts
Feedback mechanisms of the thyroid gland: (1) stimulus; (2) release of TSH; (3) release of thyroid h Feedback mechanisms of the thyroid gland: (1) stimulus; (2) release of TSH; (3) release of thyroid h
A Negative Afterimage A Negative Afterimage
Gram negative N. gonorrhoeae. Gram negative N. gonorrhoeae.
Reinforcement Reinforcement
Video: Amniocentesis and CVS Animation

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