Hair stops growing for many reasons, but one of the most common is the conversion of testosterone to the hormone DHT. As hair stops growing, the shafts eventually break, leading to male pattern baldness. After menopause, a woman's production of estrogen no longer counteracts DHT, leading to female pattern baldness, a condition in which the front hairline is preserved, but there is a general thinning of the hair.Know More
According to HowStuffWorks, Alopecia areata is an autoimmune disease that attacks the hair follicles. The condition causes the hair to fall out and growth to slow. Under normal circumstances, hair begins to grow again after a few months. A related condition, alopecia universalis, causes loss of all the scalp and body hair.
Scars often stop hair growth in the affected area. Burns, skin infections or injury or X-ray treatments can leave scars on the scalp, eliminating hair follicles so that hair no longer grows in the area.
Telogen effluvium is a condition affecting the resting phase of hair growth, which is the final phase. Under normal circumstances, an individual loses 50 to 100 hairs daily in the hair growth cycle. However, those suffering telogen effluvium lose more hairs daily. Most cases last about six months, but chronic versions persist for years. In some cases, the hair begins to grow again on its own, but in others, medication helps to restore the growth cycle.Learn more about Conditions & Diseases
An adult whose anterior pituitary gland is removed requires supplementation of corticosteroids, mineralocorticosteroids, growth hormone, sex hormones and thyroid hormone, according to the Endocrine Awareness Center for Health. The anterior pituitary gland normally produces hormones, some of which target other glands to trigger the release of other hormones.Full Answer >
Thomas Paine's "Common Sense," published on January 10, 1776, was an effective and convincing summary of the many reasons why the American colonies should not be controlled by a despotic ruler, King George III, from an island across the sea. In addition to the political and logistical argument against overseas rule of the American colonies, Paine outlined compelling reasons for the creation of a new form of government in America, one based on Republicanism and elected officials, rather than on a parliamentary monarchy. Although his was not the first argument for the new Republican form of government, Paine's "Common Sense" was an incendiary work that stood behind the colonists' commitment to wage war against the English crown in pursuit of their independence.Full Answer >
The two most common ways of HIV transmission in the United States are through sex and needle sharing, notes the Centers for Disease Control. Other less common transmission routes include through blood transfusions and from mother to child via placenta or through breast milk.Full Answer >
Common diseases that affect the circulatory system include coronary heart disease, atherosclerosis, arteriolosclerosis, arteriosclerosis, hypertension, stroke, aortic dissection, aneurysm, pericarditis, myocarditis, cardiomyopathy, tachycardia, cardiac dysrhythmias, heart valve diseases, acyanotic and cyanotic heart diseases, shock and vasculitis, as listed at Khan Academy. These diseases affect the heart, blood vessels, blood and other tissue fluids.Full Answer >