| Open system of circulation | Closed system of circulation |
| In an open system, hemolymph directly fills the organs and tissues. |
In a closed system, the blood circulates within closed vessels. |
| The intestinal fluid and blood are mixed in this. | Blood and interstitial fluid are distinct from each other. |
| Ex- molluscs, and arthropods. | Ex-annelids and vertebrates. |
| Blood is directly pumped into the cavity of the body. | Blood is pumped with the help of vessels by the heart. |
Answered by Pragya Singh | 1 year ago
Draw a standard ECG and explain the different segments in it.
Define a cardiac cycle and the cardiac output.
What is the significance of atrioventricular nodes and atrioventricular bundles in the functioning of the heart?
The sino-atrial node is called the pacemaker of our heart. Why?