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 medulla is the large bump at the top of your brain stem. It connects the brain to the spinal cord. Its main function is to control your heartrate and breathing.    â¦ Medulla is the lowest part of the hindbrain. The hindbrain is also called the brainstem.. The hindbrain is the lowermost brain division; formed by enlargement of the spinal cord as it enters the cranial cavity.