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Body Fluids and Circulations
Which one of the following is mainly responsible for the second heart sound?
Closure of atrioventricular valves
Opening of atrioventricular valves
Closure of semilunar valves
Thrust of blood on ventricular wall during atrial contraction
C.
Closure of semilunar valves
The first heart sound Lubb' is produced at the onset of ventricular systole, when the atria-ventricular valves (tricuspid and bicuspid) close. At the beginning of ventricular diastole, the semilunar valves close, producing the second heart sound 'dup'.
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Write the differences between
(a) Blood and lymph
Write the differences between
Open and closed circulatory system
What is the differences between lymph and Blood?
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?
What does the QRS wave represent in an ECG?
Name a animal having open circulatory system.
What are vasa vasorum?
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