In connection with circulatory system, valves are present
Not only in heart and blood vessels of vertebrates and invertebrates, but in vertebrate lymphatics as well
Vertebrate heart only
Vertebrate heart and invertebrate hearts only
Vertebrate hearts, invertebrate hearts and their blood vessels
Give the location of tricuspid valve
The pericardium and the pericardial fluid help in
The heart of a healthy man beats normally per minute
Valves are necessary in veins but not in arteries because
Describe internal structure of heart in detail.