Chapter: 06. Human Circulatory System
Section A: Multiple Choice Questions (5 Marks)
Choose the correct option for each question.
Which part of the blood helps in clotting?
(a) Red blood cells
(b) White blood cells
© Platelets
(d) Plasma What gives red blood cells their red color?
(a) Plasma
(b) Haemoglobin
© Water
(d) Enzymes How many chambers does a human heart have?
(a) Two
(b) Three
© Four
(d) Five Which blood vessels carry blood away from the heart?
(a) Veins
(b) Capillaries
© Arteries
(d) Venules The instrument used by doctors to listen to heartbeats is called a:
(a) Sphygmomanometer
(b) Microscope
© Stethoscope
(d) Thermometer Section B: Fill in the Blanks (5 Marks)
Complete the following sentences with the correct word(s).
The liquid part of blood is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. White blood cells are also known as the " _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the body". The _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ are the finest blood vessels that connect arteries and veins. The heart’s contraction phase is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. People with blood group _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ are called universal donors. Section C: True/False Questions (5 Marks)
Write True or False for each statement.
All arteries carry oxygenated blood. Veins have thinner walls than arteries. The left ventricle is the largest chamber of the heart. One cardiac cycle is completed in 0.8 seconds. Blood group AB has no antigens on its red blood cells. Section D: Explanation of Terms (5 Marks)
Explain the following terms in one sentence each.
Section E: Short Answer Questions (10 Marks)
Answer the following questions briefly.
List any three important functions of blood. Why do veins have valves inside them? Name the four chambers of the human heart. What are the “lub” and “dub” sounds of the heart, and what causes them? How often can a healthy adult donate blood? Section F: Diagram-Based Question (5 Marks)
Look at the diagram showing different types of blood vessels. Identify A, B, and C, and answer the questions.
State one structural difference between vessel A and vessel B. What is the main function of vessel C? Section G: Long Answer Questions (10 Marks)
Answer the following questions in 4-5 sentences each.
Describe the path of deoxygenated blood through the heart, starting from when it enters the right auricle until it reaches the lungs. Explain why having a healthy lifestyle, including specific food habits, is important for keeping the heart healthy. Section H: Identifying and Differentiate Concepts (5 Marks)
Identify the blood cell that carries oxygen and the blood cell that fights infection. Differentiate between systolic and diastolic blood pressure. Section I: Everyday Use/Critical Thinking (5 Marks)
Why does your pulse rate increase when you run or do strenuous physical activity? Why are arteries usually located deeper in the body compared to veins, which are often visible just under the skin? 
Practice Paper
