Circulatory System of Man — Important Questions
ICSE · Class 10 · Biology
38 important questions from Circulatory System of Man for ICSE Class 10 Biology, with answers. Written for the board exams 2027.
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Which components are found in blood plasma?
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Water, Albumin, Fibrinogen, Glucose
Blood plasma is the liquid part of blood containing 92% water and 8% solids including proteins like albumin and fibrinogen, plus nutrients like glucose. RBCs are formed elements, not plasma components.
Red blood cells are biconcave and lack a nucleus in mature form.
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True
Mature RBCs in mammals are indeed biconcave discs and lack a nucleus. The biconcave shape provides more surface area for gas exchange, and the absence of nucleus allows more space for hemoglobin.
Which functions are performed by white blood cells?
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Phagocytosis, Antibody production, Defense against germs
WBCs are involved in body defense through phagocytosis (engulfing germs), antibody production (by lymphocytes), and general immune responses. Oxygen transport is done by RBCs and blood clotting by platelets.
The valve between the left atrium and left ventricle is called:
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Bicuspid valve
The bicuspid valve (also called mitral valve) has two cusps and guards the opening between left atrium and left ventricle. The tricuspid valve is on the right side with three cusps.
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