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.
The CSF is absorbed by a highly specialized finger-like extension of the arachnoidnoidal membrane surrounding the brain, known as the arachnoid villi. This so called brain fluid has the important functions of cushioning the brain, maintaining pressure within the eye, and cleansing the central nervous system much like the lymphatic system serves the same function in the rest of the body.