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.
its main function is to house the pineal gland (part of the endocrine system), which secretes melatonin.it also contains the choroid plexus of the third ventricle in the brain which forms cerebral spinal fluid.or example, the function of a hammer is to strike something nearby whereas its purpose (what to strike and why) could be anything the hammer-wielder has in mind. 2.