Did you know?
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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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.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
Evolutionary adaptation to a new environment via natural selection.
Overview of gas exchange between the environment, blood, and cells.
A fossil leaf in low-grade coal
Adults in late adulthood may need to adapt to a new environment as they age and their health status
The rock cycle and the Earth’s physical environment
Two Cnidarian Body Plans