During normal hearing, sound waves travel through the ear canal and strike the eardrum causing it to vibrate. The eardrum is attached to three tiny bones in the middle ear. The last bone, the stapes, pushes on a fluid-filled chamber in the ...
Everything you do during the day, once you stand upright, begins to test the spine's ability to support your body weight. Over time these repeated daily stresses and minor injuries could add up and begin to affect the discs in your spine. ...
The spinal column consists of 33 vertebrae that protect the spinal cord and provide stability to the torso. Between each vertebra is a fibrous bundle of tissue called an intervertebral disc, which acts as a cushion to the spinal column by a...
A healthy breast is primarily composed of fatty tissue and mammary glands. Mammary glands drain into the lactiferous duct, which connects them to the nipple. During pregnancy, mammary glands swell in order to accommodate milk production. Ma...
Viruses are infectious agents that grow and multiply in living cells and can cause diseases. The Zika virus is typically spread to humans through contact with mosquitoes. The mosquito species that transmit the Zika virus have distinct blac...
The female breast is primarily composed of fatty tissue and mammary glands. Mammary glands drain into the lactiferous sinus, which connects them to the nipple. During pregnancy, mammary glands swell in order to accommodate milk production. ...
During the digestive process, much of the food that is eaten is converted into glucose, commonly known as blood sugar. Glucose circulates in the bloodstream and is used as food for the body's cells. But the cells cannot absorb glucose alone...
An allergy occurs when the body reacts to substances it can't tolerate. The substances, like tree pollen or dust mites, are called environmental antigens, or allergens, and are normally harmless. But the immune system of a person with aller...
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