GOOD EVENING. Cardiovascular system.
Cardiovascular system is the system of heart and blood vessels that circulate blood throughout the body.The blood circulating in the body transports nutrients and oxygen to all the tissues and removes carbon dioxide and waste products from the tissues.Heart is the central pump and the blood vessels are the series of the distributing and collecting tubes
Chronotropic action is the frequency of heart beat or heart rate.it is of two types
1.Tachyrardia or increase in heart rate.
2.Bradycardia or decrease in the heart rate.