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CSS - PMS - CCE - PCS - General Science Practice

Blood System – Cells, Circulation, Groups & Scientific Concepts MCQs

Explore the Blood System from a General Science perspective, including blood cells, plasma, hemoglobin, circulation, blood groups, Rh factor, clotting, immunity and related scientific concepts. Ideal for CSS, PMS, PPSC, FPSC, CCE and PCS objective examination preparation.

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Blood System – Cells, Circulation, Groups & Scientific Concepts

Blood System – Cells, Circulation, Groups & Scientific Concepts MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Blood System
During fetal life, a major organ of hematopoiesis is the:
A. Liver
B. Stomach
C. Lung
D. Thyroid
Read Theory
Correct Answer: A
The fetal liver is a major hematopoietic organ before bone marrow becomes dominant.
CSS - PMS - CCE - PCS - General Science Blood System
The earliest major site of blood cell formation in the human embryo is the:
A. Thymus
B. Yolk sac
C. Kidney
D. Pancreas
Read Theory
Correct Answer: B
Early embryonic hematopoiesis begins in the yolk sac before shifting mainly to the liver and later bone marrow.
CSS - PMS - CCE - PCS - General Science Blood System
The stem cell from which all blood cells ultimately arise is the:
A. Myoblast
B. Hematopoietic stem cell
C. Osteoblast
D. Fibroblast
Read Theory
Correct Answer: B
All formed elements of blood originate from multipotent hematopoietic stem cells in bone marrow.
CSS - PMS - CCE - PCS - General Science Blood System
Red blood cells are produced primarily in adults in the:
A. Yellow bone marrow
B. Red bone marrow
C. Liver only
D. Spleen only
Read Theory
Correct Answer: B
In adults, erythrocytes are formed mainly in red bone marrow of the axial skeleton and proximal ends of some long bones.
CSS - PMS - CCE - PCS - General Science Blood System
Which ion is the major intracellular cation of blood cells?
A. Sodium
B. Potassium
C. Chloride
D. Bicarbonate
Read Theory
Correct Answer: B
Potassium is the major intracellular cation, including within blood cells.
CSS - PMS - CCE - PCS - General Science Blood System
Which ion is the major cation of blood plasma?
A. Potassium
B. Calcium
C. Sodium
D. Magnesium
Read Theory
Correct Answer: C
Sodium is the major extracellular cation and therefore the predominant cation in plasma.
CSS - PMS - CCE - PCS - General Science Blood System
The principal buffer system of blood plasma is the:
A. Phosphate buffer only
B. Bicarbonate buffer system
C. Ammonia buffer system
D. Lactate buffer system
Read Theory
Correct Answer: B
The carbonic acid-bicarbonate system is the principal extracellular buffer system in blood.
CSS - PMS - CCE - PCS - General Science Blood System
The normal pH of arterial blood is approximately:
A. 6.8–7.0
B. 7.00–7.20
C. 7.35–7.45
D. 7.60–7.80
Read Theory
Correct Answer: C
Normal arterial blood pH is tightly regulated around 7.35–7.45.
CSS - PMS - CCE - PCS - General Science Blood System
Antibodies are mainly found in which plasma protein fraction?
A. Alpha globulins
B. Beta globulins
C. Gamma globulins
D. Albumin
Read Theory
Correct Answer: C
Immunoglobulins are concentrated mainly in the gamma-globulin fraction of plasma proteins.
CSS - PMS - CCE - PCS - General Science Blood System
A major function of plasma albumin is to:
A. Destroy bacteria directly
B. Maintain colloid osmotic pressure
C. Carry oxygen in red cells
D. Produce platelets
Read Theory
Correct Answer: B
Albumin helps retain water within the vascular compartment by maintaining plasma oncotic pressure.
CSS - PMS - CCE - PCS - General Science Blood System
The most abundant protein in human plasma is:
A. Globulin
B. Albumin
C. Fibrin
D. Hemoglobin
Read Theory
Correct Answer: B
Albumin is the most abundant plasma protein and is a major contributor to plasma colloid osmotic pressure.
CSS - PMS - CCE - PCS - General Science Blood System
Plasma differs from serum mainly because plasma contains:
A. Glucose
B. Electrolytes
C. Clotting factors such as fibrinogen
D. Antibodies only
Read Theory
Correct Answer: C
Serum is plasma after clotting has occurred, so it lacks fibrinogen and several clotting factors consumed in the clotting process.
CSS - PMS - CCE - PCS - General Science Blood System
The percentage of blood volume occupied by red blood cells is called:
A. ESR
B. Hematocrit
C. Clotting time
D. Osmotic index
Read Theory
Correct Answer: B
Hematocrit, also called packed cell volume, is the percentage of whole blood occupied by red blood cells.
CSS - PMS - CCE - PCS - General Science Blood System
Approximately what fraction of whole blood is plasma by volume?
A. About 35%
B. About 45%
C. About 55%
D. About 75%
Read Theory
Correct Answer: C
Plasma normally forms about 55% of whole blood volume, while formed elements account for roughly 45%.
CSS - PMS - CCE - PCS - General Science Blood System
Incompatible red-cell transfusion can cause:
A. Bile production
B. Agglutination and hemolysis
C. Bone formation
D. Osmosis only
Read Theory
Correct Answer: B
Antigen-antibody reactions can clump and destroy RBCs.
CSS - PMS - CCE - PCS - General Science Blood System
The Rh factor most commonly refers to antigen:
A. A
B. D
C. B
D. H
Read Theory
Correct Answer: B
Rh status is primarily defined by D antigen.
CSS - PMS - CCE - PCS - General Science Blood System
Vitamin K is especially important for normal synthesis of several:
A. Thyroid hormones
B. Antibodies
C. Digestive enzymes
D. Clotting factors
Read Theory
Correct Answer: D
Vitamin K supports clotting-factor synthesis.
CSS - PMS - CCE - PCS - General Science Blood System
The mesh protein that stabilizes a blood clot is:
A. Actin
B. Albumin
C. Globulin
D. Fibrin
Read Theory
Correct Answer: D
Fibrin forms the clot mesh.
CSS - PMS - CCE - PCS - General Science Blood System
The process that stops bleeding after vessel injury is called:
A. Phagocytosis
B. Hematopoiesis
C. Hemostasis
D. Hemolysis
Read Theory
Correct Answer: C
Hemostasis stops bleeding.
CSS - PMS - CCE - PCS - General Science Blood System
A reduction in hemoglobin concentration below normal is termed:
A. Leukemia
B. Thrombosis
C. Anemia
D. Polycythemia
Read Theory
Correct Answer: C
Anemia reduces oxygen-carrying capacity.
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