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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
![The vulva, sagittal section illustrating how the labia majora and labia minora cover and protect the](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_48_05_8251355.jpeg)
![Vapocoolant spray application while passively stretching the paracervical muscles. Take care to prot](https://biology-forums.com/gallery/47/medium_501194_15_04_16_8_31_58_234662346.jpeg)