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Olympiad (Class 5) Human body and health — practice questions — page 2

Explore 64 free Human body and health questions in Olympiad (Class 5) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Human body and health questions and exercises with answers

Showing questions 31–60 of 64.

What is the largest and thickest-walled artery that carries blood out of the heart to the body?Read the answer and worked solution →Blood passes from the smallest arteries to the smallest veins through very thin vessels. What are these vessels called?Read the answer and worked solution →Which vessels carry blood from the body back towards the heart?Read the answer and worked solution →The two large veins called the venae cavae bring blood into which chamber of the heart?Read the answer and worked solution →Human blood stays inside tubes at all times. What kind of circulatory system is this?Read the answer and worked solution →Which of these is a part of the human circulatory system?Read the answer and worked solution →The heart muscle itself gets its blood from special arteries. What are they called?Read the answer and worked solution →Which molecule in red blood cells is the main carrier of oxygen in the blood?Read the answer and worked solution →Blood from the head and arms drains mainly into which large vein on its way to the heart?Read the answer and worked solution →Which of these organs belongs to the lower respiratory tract?Read the answer and worked solution →Which muscle does most of the work when you breathe in quietly at rest?Read the answer and worked solution →When you breathe in, what happens to your diaphragm?Read the answer and worked solution →A resting adult moves about how much air in and out in one normal breath?Read the answer and worked solution →In which tiny structures of the lungs does oxygen pass into the blood?Read the answer and worked solution →After a fast run, blood carbon dioxide rises. How does breathing change?Read the answer and worked solution →A thin layer of fluid covers the lungs. What does it do while the lungs expand and shrink?Read the answer and worked solution →Coughing and sneezing are both forms of which breathing action?Read the answer and worked solution →A newborn baby has around 270 bones, but an adult has fewer. Why does the number fall?Read the answer and worked solution →Which bony part protects the brain from injury?Read the answer and worked solution →The spinal cord runs inside a column of bones. Which bones protect it?Read the answer and worked solution →Which organs are protected by the rib cage together with the spine and sternum?Read the answer and worked solution →Inside bones, a soft tissue helps make new blood cells. What is it called?Read the answer and worked solution →Which mineral that is needed for strong bones is stored in the bone matrix?Read the answer and worked solution →Which joint allows a greater range of movement than the pivot joint at the neck?Read the answer and worked solution →Which of these is NOT one of the six major functions of the skeleton?Read the answer and worked solution →How many different vitamins do humans need, counting both water-soluble and fat-soluble ones?Read the answer and worked solution →Sailors on long voyages without fresh fruit used to get scurvy. Which vitamin were they missing?Read the answer and worked solution →A child who gets very little vitamin D may develop which bone disease?Read the answer and worked solution →Skin cells can make one form of vitamin D when exposed to which of these?Read the answer and worked solution →The body makes vitamin A from which substance found in carrots?Read the answer and worked solution →

Worked practice questions

What is the largest and thickest-walled artery that carries blood out of the heart to the body?

  1. Vena cava
  2. Jugular vein
  3. Portal vein
  4. Aortic trunk
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Correct answer: D. Aortic trunk

The aorta is a massive, thick-walled artery that begins the circulation to the body.

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Blood passes from the smallest arteries to the smallest veins through very thin vessels. What are these vessels called?

  1. Ventricles
  2. Tendons
  3. Capillaries
  4. Valves
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Correct answer: C. Capillaries

Arteries branch into arterioles and then into capillaries, which merge to form venules and veins.

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Which vessels carry blood from the body back towards the heart?

  1. Bronchi
  2. Ducts
  3. Veins
  4. Arteries
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Correct answer: C. Veins

Capillaries collect into veins, which lead the blood back to the heart.

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