Mechanism of Sweat Secretion

The human body has approximately 2 million sweat glands. The eccrine sweat gland consists of a single tubule, opening onto the epidermis at one end and closed at the other. The proximal half of the tubule is the secretory coil and the distal half the reabsorptive duct. The sweat secreted onto the skin is the original tubular secretion minus the substances which are, further up the tubule, reabsorbed; from the isoosmotic fluid secreted by the coil most of the major electrolytes (Na+, Cl_, HCO3, and lactate) are transported out of the duct back into the extracellular fluid in excess of water. The final sweat secreted onto the skin is therefore hypotonic with respect to body fluids.

New Mothers Guide to Breast Feeding

New Mothers Guide to Breast Feeding

For many years, scientists have been playing out the ingredients that make breast milk the perfect food for babies. They've discovered to day over 200 close compounds to fight infection, help the immune system mature, aid in digestion, and support brain growth - nature made properties that science simply cannot copy. The important long term benefits of breast feeding include reduced risk of asthma, allergies, obesity, and some forms of childhood cancer. The more that scientists continue to learn, the better breast milk looks.

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