Question

Describe the functions of cardio acceleratory center. (Note: neurotransmitter).

Describe the functions of cardioinhibitory center (Note: neurotransmitter).

Answer 1

- The cardio acceleratory centre and cardio inhibitory centre are two cardiac centres present in the medulla oblongata that regulates the cardiac functions.
- The cardio acceleratory centre increases the cardiac activity on stimulation. It consists of sympathetic fibres that innvervate the SA node, AV node and cardiac myocyte. When the cardio acceleratory centre is activated it stimulates the sympathetic nerve fibres which release nor adrenaline (neurotransmitter). Nor adrenaline binds to specific receptors in heart and increases myocardial contraction, heart rate and cardiac output.
- The cardio inhibitory centre consists of parasympathetic beeve fibres that inneevate the sa node, av node and heart muscles. On stimulation, parasympathetic fibres release acetylcholine (neurotransmitter) that acts on heart to reduce myocardial contraction and cardiac output.