Body fluids and Circulation
ICSE · Class 11 · Biology
Most important questions from Body fluids and Circulation for ICSE Class 11 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.
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The first heart sound (lub) is produced by closure of:
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AV valves (tricuspid and mitral)
The first heart sound (lub) is caused by closure of the AV valves (both tricuspid and bicuspid/mitral) at the BEGINNING of ventricular systole. The second heart sound (dub) is caused by closure of semilunar valves.
Normal blood pressure in a healthy adult is:
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120/80 mmHg
Normal blood pressure is 120 mmHg (systolic) / 80 mmHg (diastolic). Hypertension is defined as BP persistently above 140/90 mmHg.
What is the normal platelet count per mm3?
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200,000-300,000 (2-3 lakh)
Normal platelet (thrombocyte) count is 2-3 lakh per mm3 (200,000-300,000/mm3). Low platelets = thrombocytopenia; high = thrombocytosis.
Which blood group is the universal recipient?
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Group AB
Group AB is the universal recipient because its plasma has NO antibodies (neither anti-A nor anti-B). Therefore it can receive blood from any ABO group without agglutination.
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