A sympathetic signal will speed the heart rate and heart's strength of contraction. A parasympathetic signal slows the heart rate. The autonomic nervous system regulates the body's blood pressure. Healthy blood pressure levels vary with age. Blood pressure also varies temporarily with physical or emotional stress and exercise.
Hypertension is when the blood pressure is too high and hypotension is when it is too low.
The brachiocephalic artery is an extremely short artery that is the first artery to stem directly from the aortic arch. At the neck, the brachiocephalic artery divides into the right common carotid artery and the right subclavian artery . The two brachiocephalic veins are formed at the base of the neck by the joining of the jugular veins in the neck and the subclavan veins from the arms. These two veins in turn combine in the chest to form the superior vena cava .