Question

medulla oblongata can moderate the cardiac function

Answer 1

The cardiac centre lies in the medulla oblongata of the brain. The cardiac centre is formed of cardio-inhibitor and cardio accelerator parts. The former decreases the rate of heart beat and the latter accelerates it. The cardio-inhibitor is connected with the heart through vagus nerve (it carries parasympathetic nerve fibres) and cardio accelerator through sympathetic nerve fibres. Sensory fibres extend from the receptors present in the superior vena cava, aorta and carotid sinuses to the cardiovascular centre in the medulla oblongata. The impulses received from the aorta and carotid sinuses decrease the heart rate, whereas the impulses from the vena cava increase the heart rate. In simple ill-ideological means it controls the involuntary, respiratory and other rhythmic centres of heart.