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.
Neurology A hearing test in which a vibrating tuning fork is used to evaluate hearing by placing it on the middle of the headâthe vertex. See Hearing test. WeÂ·ber test. Test in which the stem of a vibrating tuning fork is placed on the midline of the head to ascertain in which ear the sound is heard by bone conduction.