How many times does a heart beat per minute?
What is the function of bicuspid valves?
What is the function of tricuspid valves?
Why circulatory system is absent in sponges?
In sponges all cells are in direct contact with environment and its all requirements are directly met thus it does not require a circulatory system.
What does the QRS wave represent in an ECG?
Name a animal having open circulatory system.
What are vasa vasorum?
What is ECG?
What is Tachycardia?
Define Bradycardia.
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