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Blood is approximately twice as thick as water because of the cells and other components found in it.
About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
![The thymus gland. This gland lies in the mediastinum of the thoracic cavity, just above the heart. I](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_42_28_82392384.jpeg)
![Symporter protein in the loop of Henle: (a) normal reabsorption of inhibition of the Na+, K+, and ...](https://biology-forums.com/gallery/28/medium_482573_28_04_17_1_26_06_28559457.jpeg)