Structure and function of Human Body

The motor fibers from the motor cortex of the cerebral hemispheres extend down through the medulla, and most of them cross from one side to the other while going through this part of the brain. It is the crossing of motor fibers in the medulla that causes the right cerebral hemisphere to control muscles in the left side of the body. (p. 140)

Comment: Is there any functional help in this arrangement or it is simply an accident?

Antidiuretic hormone  (ADH) promotes the reabsorption of water from the kidney tubules and thus decreases the excretion of water. Large amounts of this hormone cause contraction of the smooth muscle of blood vessels and raise blood pressure. Inadequate amounts of ADH cause excessive loss of water and result in a disorder called diabetes insipidus. This type of diabetes should not be confused with diabetes mellitus, which is due to inadequate amount of insulin.

Comments: Many hormones affect several parts of the body. Treatment of one symptom causes other symptoms. Chinese medicine may provide a systematic hint about the connections of different organs and systems. Need to learn more about it.