A low hemoglobin count can also be due to blood loss, which can occur because of: 1  Bleeding from a wound. 2  Bleeding in your digestive tract, such as from ulcers, cancers or hemorrhoids. 3  Bleeding in your urinary tract.  Frequent blood 1  donation. Heavy menstrual bleeding.
The brain is the control centre for your body and it sits in your skull at the top of your spinal cord. The brain has three main parts. 1  The cerebellum (say se-re-bell-um). The brain stem, that controls a lot of the 'automatic' actions of your body such as breathing and heart beat, and links the brain to the spinal cord and the rest of the body.
Certain areas of the brain are especially important in the formation and retention of memory: The hippocampus (so- called because it's shape resembles a seahorse) is a structure in the brain that has the main role in processing information as long-term memory. The amygdala, an area near the hippocampus, processes emotion and helps to imprint emotive memories in the brain.