This set of Life Sciences Multiple Choice Questions & Answers (MCQs) focuses on “Cardiovascular System”.
1. The branch of science deals with blood, blood forming tissues and its disorders is called___________
a) Hemopoiesis
b) Cardiovascular system
c) Plasmology
d) Hematology
View Answer
Explanation: Cardiovascular system consists of mainly three components: blood, heart, and blood vessels while Hematology is the branch of science which deals with the study of blood and its tissues.
2. Human has open blood circular system.
a) True
b) False
View Answer
Explanation: The blood circulatory system of the human is closed, i.e., blood flow through veins and capillaries and without coming in direct contact with tissues and body cavity.
3. Out of the following, which one is NOT the physical characteristics of the blood?
a) Volume is 15-16 liters in an average sized adult male
b) Slightly alkaline pH
c) Constitute 20% of extracellular fluid
d) Provide 8% of total body mass
View Answer
Explanation: Total 5-6 liters of blood is present in an average adult sized male, while a human female contains 4-5 liters of blood.
4. Blood helps in transportation of the following components, except one, identify that?
a) Hormone
b) Oxygen
c) Heat
d) Lymph
View Answer
Explanation: Lymph has its own capillaries for transportation, it does not transport through the blood. Blood carries oxygen, carbon dioxide, nutrients, waste, heat, and hormones.
5. Which of the following is NOT a plasma protein?
a) Albumin
b) Globulin
c) Fibrinogen
d) Fibronectin
View Answer
Explanation: Fibronectin is not a plasma protein, but it is an extracellular matrix protein which helps in binding collagen and fibrin. Albumin, globulin, and fibrinogen are plasma proteins.
6. What is a serum in the blood?
a) Liquid portion of blood
b) Plasma minus fibrinogen
c) Tissue fluid within lymphatic vessel
d) Formed elements and plasma
View Answer
Explanation: Serum is plasma minus fibrinogen while plasma is the liquid portion of the blood. Lymph is the tissue fluid within the lymphatic vessels.
7. Name the term which defines the amount of RBC present in the blood?
a) Hemoglobin
b) Hemopoiesis
c) Hematocrit
d) Myoglobin
View Answer
Explanation: Hematocrit is the percentage of the RBC present in the blood, like if the value of hematocrit is 40 percent, then the volume of blood is 40% occupied by RBC.
8. What is the site of hemopoiesis in an embryo?
a) Yolk sac
b) Liver
c) Thymus
d) Spleen
View Answer
Explanation: Hemopoiesis first start in the yolk sac of an embryo and later in the liver, spleen, thymus, and lymph nodes of the fetus.
9. Name the term given to abnormally low levels of white blood cells?
a) Leukocytosis
b) Leucopenia
c) Lymphocyte
d) Thrombopoietin
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Explanation: Leucopenia is a condition when the count of white blood cells goes below 5000/microliter while leukocytosis is an increase in the number of WBC above 10,000 microliters.
10. Name the term given to the failure of bone marrow to produce RBC.
a) Aplastic anemia
b) Hemolytic anemia
c) Thalassemia
d) Hemorrhagic anemia
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Explanation: Aplastic anemia is the condition when bone marrow failed to produce RBC or red bone marrow gets destructed by any toxic chemicals or radiations.
11. Which type of anemia is responsible for the disease thalassemia?
a) Aplastic anemia
b) Hemolytic anemia
c) Hemorrhagic anemia
d) Iron deficiency anemia
View Answer
Explanation: Thalassemia is a type of hereditary disease where hemoglobin does not synthesize properly and results in the destruction of a large number of red blood cells.
12. Which of the following membrane is responsible for the protection of the heart?
a) Epicardium
b) Endocardium
c) Myocardium
d) Pericardium
View Answer
Explanation: Pericardium surrounds the heart and protects it. It is composed of tough, dense, inelastic, and irregular connective tissues.
13. ECG records electrical changes in which of the following layers of the heart, mark the correct option.
a) Epicardium
b) Pericardium
c) Endocardium
d) Myocardium
View Answer
Explanation: ECG is an electrocardiogram, which records electrical changes in the myocardium layer of the heart. Body fluid contains ions that produce electric current and causes changes in the myocardium.
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