|
|
Your heart beats over 36 million times a year.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
![teach their children to care for the earth in hopes of passing on a better world to future generatio](https://biology-forums.com/gallery/47/medium_18099_21_09_12_5_53_31.jpeg)
![This young boy with muscular dystrophy needs to receive tube feedings and home nursing care. He atte](https://biology-forums.com/gallery/47/medium_14755_30_09_12_4_32_25_9134396.jpeg)
![Coronary stent. Illustration of an angiogram revealing a coronary stent, which helps prevent closure](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_45_100291618.jpeg)