A genetic disorder characterized by impaired blood clotting

Blood: Composition, Functions, and Circulatory System

Biology

This comprehensive quiz covers the composition of blood, including plasma and its components, as well as the morphological elements like erythrocytes, leukocytes, and platelets. It delves into the various functions of blood, such as transport, regulation, and defense. The quiz also explores the circulatory system, the structure and function of the heart and blood vessels, and the critical concept of blood groups and transfusion compatibility, including serological conflicts. Finally, it touches upon blood clotting and its disorders.

Blood Circulation Physiology

22 Questions Medium Ages 14+ Feb 28, 2026

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About this Study Set

This study set covers Biology through 22 practice questions. This comprehensive quiz covers the composition of blood, including plasma and its components, as well as the morphological elements like erythrocytes, leukocytes, and platelets. It delves into the various functions of blood, such as transport, regulation, and defense. The quiz also explores the circulatory system, the structure and function of the heart and blood vessels, and the critical concept of blood groups and transfusion compatibility, including serological conflicts. Finally, it touches upon blood clotting and its disorders. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 22 questions from the Blood: Composition, Functions, and Circulatory System study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is blood primarily composed of?

A Plasma and red blood cells
B Plasma and leukocytes
C Plasma and platelets
D Plasma and cellular components (morphotic elements)

2 What percentage of blood volume does plasma constitute after centrifugation?

A Approximately 15%
B Approximately 30%
C Approximately 55%
D Approximately 70%

3 Which component forms the lowest layer after blood centrifugation?

A Leukocytes
B Platelets
C Erythrocytes
D Plasma

4 What is the main function of erythrocytes?

A Transporting nutrients
B Transporting oxygen and carbon dioxide
C Fighting infections
D Clotting blood

5 What is the primary role of leukocytes?

A Transporting hormones
B Maintaining hydration
C Defending the body against pathogens
D Carrying nutrients

6 Which blood components are fragments of bone marrow cells and are crucial for blood clotting?

A Erythrocytes
B Leukocytes
C Platelets
D Plasma proteins

7 What is the function of plasma?

A Only transporting oxygen
B Transporting most substances, participating in immune responses and blood clotting
C Forming the buffy coat
D Transporting only waste products

8 What substance in plasma is essential for blood clotting?

A Albumin
B Globulin
C Fibrinogen
D Antibodies

9 What does the hematocrit index measure?

A The percentage of plasma in blood
B The percentage of leukocytes in blood
C The ratio of red blood cell volume to total blood volume
D The concentration of platelets

10 How does blood maintain proper hydration, pH, and body temperature?

A Through the action of platelets
B Through the transport of oxygen by erythrocytes
C Through its regulatory function
D By forming blood clots

11 What is the primary function of the circulatory system?

A Digesting food
B Transporting substances throughout the body
C Producing hormones
D Filtering waste from the blood

12 Which chamber of the heart receives deoxygenated blood from the body?

A Left atrium
B Left ventricle
C Right atrium
D Right ventricle

13 What type of blood do arteries typically carry away from the heart in the systemic circulation?

A Deoxygenated blood
B Oxygenated blood
C Mixed blood
D Nutrient-rich blood

14 What is the function of valves in the heart and blood vessels?

A To pump blood
B To regulate blood pressure
C To ensure unidirectional blood flow
D To exchange gases

15 What are capillaries?

A Large blood vessels that carry blood away from the heart
B Large blood vessels that carry blood towards the heart
C The smallest blood vessels where substance exchange occurs
D Valves that prevent backflow

16 What is blood clotting (coagulation)?

A A process that increases blood flow
B A protective mechanism to prevent blood loss from damaged vessels
C The removal of waste products from the blood
D The transport of oxygen

17 What is hemophilia?

A A condition where blood clots too easily
B A genetic disorder characterized by impaired blood clotting
C A disease affecting red blood cell production
D A type of anemia

18 What is a thrombosis?

A Excessive bleeding
B The formation of a blood clot within a blood vessel
C A rapid heart rate
D Low blood pressure

19 What is a serological conflict?

A A mismatch between blood types during transfusion, leading to agglutination
B A conflict between white blood cells and pathogens
C A discrepancy in hormone levels
D An imbalance of electrolytes in the blood

20 What determines a person's blood group in the ABO system?

A The presence of Rh antigens on red blood cells
B The presence of specific antigens (A and B) on the surface of erythrocytes
C The type of antibodies present in the plasma
D The amount of hemoglobin in red blood cells

21 Individuals with blood group AB have which antigens and antibodies?

A Antigens A and B; no antibodies
B Antigen A; anti-B antibodies
C Antigen B; anti-A antibodies
D No antigens; anti-A and anti-B antibodies

22 What is the Rh factor?

A An antigen found in plasma
B An antigen found on the surface of red blood cells
C An antibody that attacks red blood cells
D A protein involved in blood clotting

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