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Did you know?

About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Research Methods: Advantages and Limitations Research Methods: Advantages and Limitations
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Video: Flexor reflex & Crossed extensor reflex

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