Body systems rely on a balance of electrolytes, enzymes, and hormones like cortisol. Understand fat metabolism, urinary output, and energy system functions.
Creatinine comes from your body's everyday use of your muscles -- and also from eating meat. As blood flows through the kidneys, creatinine is excreted out into your urine along with other waste products.
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The body has two lines of natural defense to protect against infection. The first are physical barriers, such as the skin, body secretions and mucous membranes. The second line of defense is the immune system.
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