Human Circulatory System and Heart Structure
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Questions and Answers

What is the function of semilunar valves in the heart?

  • Regulate the flow of nutrients in the blood
  • Filter waste products in the blood
  • Prevent blood from flowing back into the ventricles (correct)
  • Transport oxygen to the body's tissues

    • What term refers to the medical condition where coronary arteries are narrowed due to plaque buildup?

  • Atherosclerosis (correct)
  • Coronary thrombosis
  • Thrombosis
  • Atheroma

    • Which blood vessels carry oxygen-rich blood away from the heart?

  • Arteries (correct)
  • Venules
  • Veins
  • Capillaries

    • What connects arteries and veins in the circulatory system?

    <p>Capillaries</p> Signup and view all the answers

    Which of the following is NOT a component of atherosclerotic plaque in coronary arteries?

    <p>Iron</p> Signup and view all the answers

    What is the main function of red blood cells?

    <p>Contain haemoglobin that transports oxygen</p> Signup and view all the answers

    What can occur if a piece of plaque breaks away from an artery due to atherosclerosis?

    <p>Formation of a thrombus</p> Signup and view all the answers

    Which blood vessels bring blood back to the heart?

    <p>Veins</p> Signup and view all the answers

    What is the primary cause of a heart attack according to the text?

    <p>Blockage of coronary arteries by fat and cholesterol</p> Signup and view all the answers

    In which individuals is a thrombus more likely to form?

    <p>Individuals who are immobile</p> Signup and view all the answers

    What is the purpose of platelets in the blood?

    <p>Form clots at the site of wounds</p> Signup and view all the answers

    What is the medical term for the buildup of materials that adhere to arteries?

    <p>Atheroma</p> Signup and view all the answers

    Which type of muscle makes up the wall of the heart?

    <p>Cardiac muscle</p> Signup and view all the answers

    Which valve is located between the right ventricle and the pulmonary trunk?

    <p>Pulmonary semilunar valve</p> Signup and view all the answers

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

    <p>Right atrium</p> Signup and view all the answers

    What is the shape of the human heart often compared to?

    <p>Man's closed fist</p> Signup and view all the answers

    What is the function of the aortic semilunar valve?

    <p>Prevents backflow from aorta to left ventricle</p> Signup and view all the answers

    What does the left atrioventricular valve prevent when the ventricles contract?

    <p>Backflow into left atrium</p> Signup and view all the answers

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