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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
![(A) The levels of the spinal cord and spinal nerves. (B) Photograph of the spinal cord as it descend](https://biology-forums.com/gallery/47/medium_14755_27_08_12_4_56_12_82161984.jpeg)
![In a craniotomy, a portion of the skull and overlying scalp is pulled back to allow access to the br](https://biology-forums.com/gallery/47/medium_14755_07_10_12_3_19_34_9330731.jpeg)