Circulatory System Quiz With Answers

Reviewed by Stephen Reinbold
Stephen Reinbold, PhD (Biological Sciences) |
Biology Instructor
Review Board Member
Stephen Reinbold has a PhD in Biological Sciences and a strong passion for teaching. He taught various subjects including General Biology, Environmental Science, Zoology, Genetics, and Anatomy & Physiology at Metropolitan Community College in Kansas City, Missouri, for nearly thirty years. He focused on scientific methodology and student research projects. Now retired, he works part-time as an editor and engages in online activities.
 , PhD (Biological Sciences)
By Knoelking1993
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  • 1/29 Questions

    Where is the heart located in your body?

    • Stomach
    • Head
    • Chest
    • Back
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About This Quiz

The Circulatory System Quiz is designed to assess your knowledge of the vital systems that help blood circulate throughout the body. In this quiz, you will be asked a series of questions related to the anatomy and function of the heart, blood vessels, and blood flow.

Each question has been carefully crafted to test your understanding of these complex processes. This, circulatory system quiz with answers will not only help you assess your knowledge but also provide explanations to enhance your learning. If you're studying for an exam or simply interested in understanding the circulatory system better, this quiz serves as an excellent resource for both students and healthcare professionals.

Circulatory System Quiz With Answers - Quiz

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  • 2. 

    The movement of blood through the heart and body is called circulation. True or False.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because the movement of blood through the heart and body is indeed called circulation. The heart acts as a pump, pumping oxygenated blood to the body's tissues and organs through a network of blood vessels, and then receiving deoxygenated blood back to be reoxygenated. This continuous flow of blood is essential for delivering oxygen and nutrients to the cells, removing waste products, and maintaining overall bodily functions.

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  • 3. 

    Where is plasma found?

    • In blood

    • In urine

    • In your brain

    • In your muscles

    Correct Answer
    A. In blood
    Explanation
    Plasma is a component of blood that makes up about 55% of its total volume. It is a yellowish fluid that carries various substances such as nutrients, hormones, waste products, and antibodies throughout the body. Plasma also plays a crucial role in maintaining blood pressure and regulating body temperature. It is distinct from urine, which is produced by the kidneys to eliminate waste products from the body. It circulates through blood vessels and is found throughout the body.

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  • 4. 

    The heart is approximately the size of what part of your body?

    • Leg

    • Brain

    • Arm

    • Fist

    Correct Answer
    A. Fist
    Explanation
    The human heart is roughly the size of a closed fist. This analogy helps people understand the organ’s dimensions more easily. The heart’s size is proportional to its function, as it needs to be strong and efficient enough to pump blood throughout the body. The fist comparison allows us to visualize its size relative to the rest of the body. Its size also reflects the strength required to pump blood under pressure through the large blood vessels, such as the aorta, which carries oxygenated blood to the body’s tissues and organs.

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  • 5. 

    What do red blood cells transport?

    • Oxygen

    • Water (H2O)

    • Nitrogen

    • Hydrogen

    Correct Answer
    A. Oxygen
    Explanation
    Red blood cells transport oxygen. This is because red blood cells contain a protein called hemoglobin, which binds to oxygen molecules in the lungs and carries them to the body's tissues. Oxygen is necessary for cellular respiration, where it is used to produce energy. Therefore, red blood cells play a crucial role in delivering oxygen to all parts of the body, ensuring proper functioning and survival.

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  • 6. 

    How many chambers does the human heart have?

    • 1

    • 2

    • 3

    • 4

    • 5

    Correct Answer
    A. 4
    Explanation
    The human heart has four chambers, which are the left atrium, left ventricle, right atrium, and right ventricle. These chambers work together to pump blood throughout the body. The right atrium receives deoxygenated blood from the body and passes it to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and passes it to the left ventricle, which then pumps it out to the rest of the body. Therefore, the correct answer is 4.

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  • 7. 

    What is your most active muscle?

    • Your lungs

    • Your legs

    • Your arms

    • Your heart

    Correct Answer
    A. Your heart
    Explanation
    The heart is the correct answer because it is constantly working to pump blood throughout the body, supplying oxygen and nutrients to all the other muscles. It beats around 100,000 times a day, even when we are at rest. This constant activity makes it the most active muscle in our body.

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  • 8. 

    Which of the following is NOT a function of white blood cells.

    • Guard against infection

    • Fight parasites

    • Attack bacteria

    • Carry oxygen

    Correct Answer
    A. Carry oxygen
    Explanation
    White blood cells, also known as leukocytes, are an essential part of the immune system and play a crucial role in defending the body against infections. They are responsible for fighting parasites and attacking bacteria, but they do not carry oxygen. The transportation of oxygen is primarily carried out by red blood cells, which contain hemoglobin and are specifically designed for this purpose. Therefore, carrying oxygen is not a function of white blood cells.

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  • 9. 

    What is the most common type of blood cells?

    • White blood cells

    • Platelets

    • Red blood cells

    Correct Answer
    A. Red blood cells
    Explanation
    Red blood cells are the most common type of blood cells in the human body. They are responsible for carrying oxygen from the lungs to all the tissues and organs in the body, and also help remove carbon dioxide and waste products. Red blood cells are produced in the bone marrow and have a lifespan of about 120 days. They make up about 40-45% of the total blood volume and are easily identifiable due to their red color, which is caused by the presence of a protein called hemoglobin.

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  • 10. 

    Where do the veins carry blood to?

    • To the heart

    • Away from the heart

    Correct Answer
    A. To the heart
    Explanation
    Veins carry blood back to the heart. After the oxygen-rich blood is delivered to the body's tissues by the arteries, the veins collect the oxygen-depleted blood and transport it back to the heart. From there, the blood is pumped to the lungs to be oxygenated again before returning to the rest of the body. Therefore, the correct answer is "To the heart."

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  • 11. 

    Where do arteries carry blood?

    • To the heart

    • Away from the heart

    Correct Answer
    A. Away from the heart
    Explanation
    Arteries carry blood away from the heart to various parts of the body. They transport oxygen-rich blood from the heart to the tissues and organs, except for the pulmonary arteries, which carry oxygen-depleted blood from the heart to the lungs for oxygenation.

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  • 12. 

    What organ is responsible for pumping blood in the circulatory system?

    • Heart

    • The heart, the brain, and the lungs

    • The lungs, the blood, and the blood vessels

    • The brain, the heart, and the blood vessels

    Correct Answer
    A. Heart
    Explanation
    The heart is the central organ of the circulatory system. It works as a powerful pump that keeps blood moving throughout the body, delivering oxygen and nutrients to cells while removing waste products. Working alongside blood and blood vessels, the heart ensures the circulatory system functions effectively. Without the heart's constant pumping action, the entire system would come to a stop, making it essential to life.

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  • 13. 

    What is the smallest blood vessel?

    • Arteries

    • Capillaries

    • Veins

    Correct Answer
    A. Capillaries
    Explanation
    Capillaries are the smallest blood vessels in the body. They are responsible for connecting arteries to veins and allow for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Capillaries have thin walls that allow for easy diffusion of substances, and their large surface area enables efficient exchange. This makes them crucial for delivering oxygen and nutrients to cells and removing waste products from the body. Arteries and veins are larger blood vessels that transport blood to and from the capillaries.

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  • 14. 

    What links the arteries to the veins?

    • Muscle

    • Capillaries

    • Aorta

    Correct Answer
    A. Capillaries
    Explanation
    Capillaries are the tiny blood vessels that connect arteries to veins. They form a network throughout the body, allowing for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Capillaries have thin walls, which enable them to facilitate the diffusion of substances. This connection between arteries and veins through capillaries is crucial for maintaining proper blood flow and ensuring that oxygen and nutrients are delivered to the tissues while waste products are removed.

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  • 15. 

    What is the fluid that surrounds and protects the heart called?

    • Pericardium

    • B-cells

    • Hemoglobin

    • Red blood cell

    Correct Answer
    A. Pericardium
    Explanation
    The pericardium is a protective, double-layered membrane that encases the heart. Between its two layers is a small amount of lubricating fluid called pericardial fluid. This fluid plays a crucial role by reducing friction as the heart beats, allowing smooth and effortless movement within the chest cavity. The pericardium not only cushions the heart from physical shocks and trauma but also helps prevent the heart from over-expanding when blood volume increases. Additionally, it serves as a defense barrier, reducing the risk of infections spreading to the heart from nearby organs. Together, the pericardium and its fluid ensure the heart remains stable, protected, and functioning efficiently with every beat.

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  • 16. 

    What is your heart made of?

    • Skin

    • Tissue

    • Muscle

    Correct Answer
    A. Muscle
    Explanation
    The heart is made up of muscle tissue. The heart is a vital organ responsible for pumping blood throughout the body. It requires strong, contractile muscles to generate the force needed to circulate blood effectively. The heart muscle, known as cardiac muscle, is unique and different from other types of muscle in the body. It has the ability to contract and relax rhythmically, allowing the heart to beat and pump blood continuously.

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  • 17. 

    What makes blood clotting possible?

    • Platelets

    • Hemoglobin

    • Lymphocytes

    • Plasma

    Correct Answer
    A. Platelets
    Explanation
    Blood clotting is made possible by platelets. Platelets are small cell fragments found in the blood that play a crucial role in the clotting process. When there is an injury or damage to a blood vessel, platelets rush to the site and form a plug to stop bleeding. They also release chemicals that activate other clotting factors, leading to the formation of a fibrin clot that seals the wound. Without platelets, the blood would not be able to form clots effectively, leading to excessive bleeding and potentially life-threatening situations.

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  • 18. 

    What do white blood cells contain that red blood cells do not?

    • Nucleus

    • Brain

    • Red color

    • Hemoglobin

    Correct Answer
    A. Nucleus
    Explanation
    White blood cells contain a nucleus, while red blood cells do not. The nucleus is a membrane-bound organelle that contains the genetic material of the cell. It plays a crucial role in controlling the cell's activities and is responsible for the cell's growth, reproduction, and response to stimuli. Red blood cells, on the other hand, lack a nucleus to make more space for the protein hemoglobin, which is responsible for carrying oxygen to the body's tissues.

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  • 19. 

    Which of the following could be described as the body's defense soldiers?

    • Your heart

    • Red blood cells

    • White blood cells

    • Your lungs

    Correct Answer
    A. White blood cells
    Explanation
    White blood cells could be compared to soldiers because they play a crucial role in defending the body against foreign invaders, just like soldiers protect their country against enemies. White blood cells are part of the immune system and help fight off infections and diseases, similar to how soldiers protect against threats to the nation. They both serve a protective function and are essential for maintaining the overall health and well-being of the body or country.

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  • 20. 

    Through circulation, the primary function of the heart is to provide the body with:

    • Nutrients

    • A way to get rid of waste

    • Oxygen

    • Carbon dioxide

    Correct Answer
    A. Oxygen
    Explanation
    The heart's essential role in circulation involves pumping blood to deliver oxygen to the body's tissues. As blood circulates, it supplies vital nutrients and carries away waste products, ensuring cellular function. Therefore, the primary function is to provide the body with oxygen for metabolic processes and overall well-being.

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  • 21. 

    What leaves the blood when it is in the lungs?

    • Oxygen

    • Carbon Dioxide

    • Nitrogen

    • Phosphorus

    Correct Answer
    A. Carbon Dioxide
    Explanation
    When in the lungs, carbon dioxide leaves the blood. This is because during the process of respiration, oxygen is taken in by the lungs and transported to the cells, while carbon dioxide is produced as a waste product by the cells and carried back to the lungs through the bloodstream. In the lungs, carbon dioxide diffuses from the blood into the alveoli, which are tiny air sacs where gas exchange occurs. From the alveoli, carbon dioxide is then exhaled out of the body.

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  • 22. 

    What divides the right side of the heart from the left side?

    • Septum

    • Atrium

    • Ventricles

    • Wall

    Correct Answer
    A. Septum
    Explanation
    The septum is a thick wall of tissue that divides the right and left sides of the heart. This structure is crucial in preventing the mixing of oxygenated and deoxygenated blood. The left side of the heart pumps oxygen-rich blood to the body, while the right side pumps oxygen-poor blood to the lungs for oxygenation. The septum ensures this separation, maintaining the efficiency of blood circulation and ensuring that oxygenated blood reaches the body’s tissues, while deoxygenated blood is routed for re-oxygenation in the lungs.

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  • 23. 

    The right side of the heart pumps the blood _____ the heart ______ the lungs.

    • To, from

    • From, to

    • To, to

    • From, from

    Correct Answer
    A. From, to
    Explanation
    The right side of the heart pumps blood from the heart to the lungs. This is because the right side of the heart receives deoxygenated blood from the body through the veins and pumps it to the lungs via the pulmonary artery. In the lungs, the blood picks up oxygen and releases carbon dioxide, becoming oxygenated. Then, the oxygenated blood returns to the left side of the heart via the pulmonary veins to be pumped out to the rest of the body.

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  • 24. 

    What happens when blood pools in the veins?

    • You pass out.

    • You become paralyzed.

    • You get varicose veins.

    Correct Answer
    A. You get varicose veins.
    Explanation
    When blood pools in the veins, it can cause the veins to become enlarged and twisted, resulting in varicose veins. This happens when the valves in the veins that help regulate blood flow become weak or damaged, causing blood to flow backward and accumulate in the veins. Varicose veins can be painful and unsightly, and they commonly occur in the legs.

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  • 25. 

    What is the largest blood vessel?

    • Aorta

    • Artery

    • Capillary

    • Veins

    Correct Answer
    A. Aorta
    Explanation
    The aorta is the largest blood vessel in the human body. It is the main artery that carries oxygenated blood from the heart to the rest of the body. It originates from the left ventricle of the heart and branches out to supply blood to all organs and tissues. Due to its size and function, the aorta is considered the largest blood vessel.

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  • 26. 

    What do we call platelet plugs?

    • Scabs

    • Band-aids

    • Cuts

    • Bruises

    Correct Answer
    A. Scabs
    Explanation
    Platelet plugs are formed when platelets in the blood clump together to stop bleeding from an injured blood vessel. These clumps of platelets, along with fibrin and other proteins, form a temporary seal over the injured area, preventing further blood loss. This temporary seal is commonly known as a scab.

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  • 27. 

    The left and right sides of your heart work ____.

    • Simultaneously

    • Separately

    • Against each other

    • None of the above

    Correct Answer
    A. Simultaneously
    Explanation
    The heart is divided into two halves, the left and the right, each consisting of an atrium and a ventricle. The right side of the heart receives deoxygenated blood from the body and pumps it to the lungs for oxygenation, while the left side of the heart receives oxygenated blood from the lungs and pumps it to the rest of the body. Both sides of the heart work together in a coordinated manner to ensure that oxygen-rich blood is supplied to the body's tissues and organs while deoxygenated blood is sent to the lungs for reoxygenation. This simultaneous pumping action is what allows the circulatory system to function effectively.

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  • 28. 

    What color are white blood cells?

    • White

    • Red

    • Yellow

    • Colorless

    Correct Answer
    A. Colorless
    Explanation
    White blood cells are colorless because they lack pigmentation. They are transparent and do not absorb or reflect light, which gives them a colorless appearance. This allows them to move easily through the bloodstream and carry out their functions of fighting infection and disease.

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  • 29. 

    What percentage of plasma is water?

    • 60

    • 70

    • 80

    • 90

    • 95

    Correct Answer
    A. 90
    Explanation
    Plasma is the liquid component of blood and is composed mostly of water. It makes up about 90 percent of plasma, with the remaining 10 percent consisting of various solutes such as proteins, electrolytes, hormones, and waste products. This high water content allows plasma to carry nutrients, hormones, and waste products throughout the body, regulate body temperature, and maintain blood pressure.

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Stephen Reinbold |PhD (Biological Sciences) |
Biology Instructor
Stephen Reinbold has a PhD in Biological Sciences and a strong passion for teaching. He taught various subjects including General Biology, Environmental Science, Zoology, Genetics, and Anatomy & Physiology at Metropolitan Community College in Kansas City, Missouri, for nearly thirty years. He focused on scientific methodology and student research projects. Now retired, he works part-time as an editor and engages in online activities.

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  • Mar 07, 2025
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    Expert Reviewed by
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  • Jan 28, 2010
    Quiz Created by
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