DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.Nearly every cell in a personâs body has the same DNA.Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).NA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.
1 In particular, blood pressure lowering medications may cause faintness if they lower your blood pressure too much. 2  Anxiety disorders. 3  Certain anxiety disorders may cause lightheadedness or a woozy feeling often referred to as dizziness.
Iron Deficiency. Not getting enough iron can make your legs feel tired, HelpGuide.org reports. An iron deficiency can cause restless leg syndrome, or RLS. One of the symptoms of RLS is a tired and heavy feeling in your legs. This predominantly happens when you lie down or rest, and usually only affects you during bedtime, but it can occur much earlier in the day depending upon your deficiency.