Circulatory System

No. Circulatory System       
1. Circulatory system consists of heart, blood and blood vessels.
2. Circulation occurs between heart and blood vessels in closed circulatory system.
3. In open circulatory system heart pumps blood into spaces. Blood vessels are absent. Open circulatory system is in Grosshopper.
4. The open circulatory system consists heart sinus and blood.
5. In double circuit circulation blood passes twice through the heart. Blood passes twice through the heart in frog and other higher animals.
6. In single circuit circulation blood passes through the heart only once.
7. The heart that pumps blood into lungs for oxygenation is called Pulmonary Heart.
8. Aorta is the largest artery. It carries blood from the heart.
9. There are 8 pairs of heart in Earthworm.
10. In Earthworm coelomic fluid is present between bodywall and alimentary canal.
11. There are two major blood vessels in Earthworm. They are:
12. a) Dorsal blood vessel b) Ventral blood vessel
2. Ventral blood vessel is below the alimentary canal and supplies blood to various organs.
13. Dorsal blood vessel is above the alimentary canal and collects blood from various organs.
14. The blood of Earthworm is red in colour. It consists water, salts and white blood cells but red blood cells are absent.
15. Alary muscles are present in Cockroach. The are in fan shape.
16. Blood flows in the spaces called sinuses in cockroach.
17. In cockroach circulatory system consists of heart, blood, sinuses and Alary muscles.
18. The blood of Cockroach is white in colour due to the absence of Haemoglobin. So it doesn`t carry oxygen.
19. The contractions and relaxations of alary muscles of Cockroach help in forcing the blood into the heart.
20. The heart of reptiles consists two auricles and one ventricle.
21. The ventricle in reptiles is incompletely divided into two chambers.
22. In Fish branchial heart pumps blood to Gills.
23. In fish heart consists two chambers.
24. In fishes deoxygenated blood is oxygenated in Gills.
25. Deoxygenated blood in fishes is collected into Sinus Venosus.
26. Operculum occurs in Bony fishes.
27. Transport of the substances in protozoa occur either by diffusion or by the movements of cytoplasm.
28. The blood in Grasshopper is white in colour.
29. The blood in crabs and snails is blue in colour.
30. The ventricle in Lizard is incompletely divided.
31. Sinus Venosus is absent in birds and mammals.
32. The heart in birds and mammals consists 4 chambers.
33. There are 8 pairs of hearts in megascolex.
34. In multicellular organisms blood and lymph fluids are developed for transport of substances.
35. The heart in amphibian consists three chambers.
36. In amphibians deoxygenated blood is collected into Caval Veins. Caval veins are united to form Sinus venosus.