With increasing age, the kidney atrophy shifts the renal parenchyma pyelon index to 1:2:1. Renal Ultrasound Anatomy The kidney is a bean-shaped organ, which has usually a smooth convex lateral organ boundary.
Bipolar disorder may result from a chemical imbalance within the brain. The brain's functions are controlled by chemicals called neurotransmitters. An imbalance in the levels of one of these neurotransmitters, such as norepinephrine, may cause bipolar disorder. When levels of this chemical are too high, mania occurs.
Causes of Bipolar Disorder. Researchers don't know exactly what causes bipolar disorder. Most likely, there's no single factor but rather multiple factors that cause bipolar disorder to develop. Genetics do play a role and increase the likelihood that someone will develop the disorder.hemicals in the brain could also predispose people to bipolar disorder [source: CCI ]. Researchers suspect that the levels of neurotransmitters dopamine, serotonin, norepinephrine, and GABA (gamma aminobutyric acid) might be involved in the disorder.