Upper portion is heated as it acts as a control for comparing with lower portion of the test tube.Turbidity occurs in the upper portion of urine,while lower portion remains clear.Turbidity may appear due to phosphates,carbonates which on addition of acetic acid if persists denotes presence of proteins in the urine.
The narrow lower portion of the uterus is called the cervix.
It is the Asthenosphere
Human skin is composed of three layers. The top layer is the epidermis, the middle layer is the dermis and the lower portion of the skin is the lower dermis.
The cardiac portion of the stomach is in the lower section of the stomach. It is also called the "cardia". It is the place where most carbohydrate digestion occurs. It also stores ingested food.
The ice compartment is placed at the upper portion of the refrigerator, because the lower compartment is warmer and this might cause the ice to melt.
Mandible is the scientific name for lower portion (the movable portion) of the jaw.
Pneumonia in lower portion of the lungs
The lower rear portion of the skullBack of the head.
The vermiform appendix, or appendix, hangs from the lower portion of the cecum. The cecum is the first section of the large intestine.
The first ingredient needed in instability, which occurs when the lower atmosphere is warm and moist while the upper portion is cold and dry. Instability is what drives thunderstorms.