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The medulla oblongata is the lower half of the brainstem. In discussions of neurology and similar contexts where no ambiguity will result, it is often referred to as simply the medulla. The medulla contains the cardiac, respiritory , vomiting and vasomotor centers and deals with autonomic functions, such as breathing, heart rate and blood pressure
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∙ 13y ago
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Is the atrioventricular node starts each heart beat and is often called the pacemaker of the heart for that reason?
No, the sino-atrial node is the pacemaker of the heart. It receives signals from the heart centre in the medulla oblingata via either the parasympathetic nerve or sympathetic nerve. It the sends a signal to the right- and left artrium and then to the atrioventricular node which stimulates the right- and left ventricles to contract
Function of the sinoatrial node?
To originate muscle contractions and regulate the rhythm of the heart. Dictates the heart rate at 70 - 80 beats per minute when the body is at rest. It originates the electrical impulse for the entire conduction system of the heart.
What causes lack of oxygen in blood?
There are a multiple reasons for low oxygen saturation, including cardiovascular disease, chronic obstructive pulmonary disease, pneumonia, cardiomyopathy, and even dehydration. The main problem is that the body is starved for oxygen. When the bloodstream does not receive enough oxygen from either the lungs or heart or a disease or illness is depleting the oxygen from the bloodstream, the organs and the brain suffer. Injury and blood loss will also cause low oxygen saturation.
