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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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.
Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.
Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
![The primate dental formula illustrated for (a) the lower dentition of an Old World monkey and (b) th](https://biology-forums.com/gallery/47/medium_275816_26_01_15_5_17_45_203701397.jpeg)
![Standing at the head of the table, apply effleurage to upper trapezius from neck to shoulder using a ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_35_50_331681373.jpeg)