True, The sinoatrial (SA) node is the natural pacemaker of the heart., The medulla oblongata regulates heart rate and respiration., The vagus nerve is Cranial Nerve X., The hypothalamus helps regulate body temperature, The proximal convoluted tubule is the main site of reabsorption in the nephron., The epiglottis prevents food from entering the trachea during swallowing., The right atrium receives deoxygenated blood from the body., False, The pulmonary veins carry deoxygenated blood., The myocardium is the outermost layer of the heart., Erythropoietin is primarily produced by the pancreas.

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