The circulatory and respiratory systems working together

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Ari reads a map of blood flow. Box X is the vessel that carries blood out of the right ventricle toward the lungs. What is box X?

   • Vena cava, the vessel that returns blood to the right atrium
   • Aorta, the vessel that leaves the left ventricle
   • Pulmonary artery, the vessel that leaves the right ventricle
   • Pulmonary vein, because veins carry the oxygen-poor blood

2. Read this first

   Use this

   Map of blood flow (model, not to scale). Arrows, each marked with what it carries: body to right atrium, oxygen-poor blood; right atrium to right ventricle, oxygen-poor blood; right ventricle to lungs, oxygen-poor blood; lungs to left atrium, oxygen-rich blood; left atrium to left ventricle, oxygen-rich blood; left ventricle to box Y, oxygen-rich blood; box Y to body, oxygen-rich blood.

3. 2.

   Bo reads a map of blood flow. Box Y is the vessel that carries oxygen-rich blood out of the left ventricle to the body. What is box Y?

   • Aorta, the main artery that leaves the left ventricle
   • Vena cava, a vein that carries blood away from the heart
   • Pulmonary vein, the vessel that returns blood to the left atrium
   • Pulmonary artery, the vessel that takes blood from the left ventricle

4. Use this

   Map of blood flow (model, not to scale). Arrows, each marked with what it carries: body to right atrium, oxygen-poor blood; right atrium to right ventricle, oxygen-poor blood; right ventricle to lungs, oxygen-poor blood; lungs to box Z, oxygen-rich blood; box Z to left atrium, oxygen-rich blood; left atrium to left ventricle, oxygen-rich blood; left ventricle to body, oxygen-rich blood.

5. 3.

   Esme reads a map of blood flow. Box Z is the vessel that carries oxygen-rich blood from the lungs back to the left atrium. What is box Z?

   • Aorta, the vessel that carries oxygen-rich blood to the body
   • Pulmonary vein, the vessel that returns blood to the left atrium
   • Pulmonary artery, because arteries carry oxygen-rich blood
   • Vena cava, the vessel that returns blood to the right atrium
6. 4.

   Jun fills in the map of blood flow. Oxygen-poor blood leaves the right ventricle, and oxygen-rich blood reaches the left atrium. What belongs in the blank box?

   • The left ventricle, the pump on the left side
   • The right atrium, the chamber that fills first
   • The body, where blood goes right after it leaves the heart
   • The lungs, where oxygen enters the blood
7. 5.

   Kira fills in the map. The left atrium sends oxygen-rich blood to the blank box, which pumps it out to the body. What is the blank box?

   • The lungs, which make the oxygen the body needs
   • The left ventricle, the pump for the body
   • The right atrium, the chamber that receives blood
   • The right ventricle, the pump for the body
8. 6.

   Noah compares two maps of one trip of blood around a person. Which case shows what really happens to blood in a person?

   • Case 2, because the lungs make the oxygen that the body needs
   • Case 2, because blood visits the lungs and then the body
   • Case 1, because blood goes from the heart to the body and back
   • Case 1, because one loop is enough to reach the lungs and body
9. 7.

   Two maps (model, not to scale) of a vessel that takes blood to a leg muscle. Pia compares two cases of a vessel that takes blood to a leg muscle. Which case lets more blood reach the muscle?

   • Case 1, because a widened vessel lets more blood through
   • Case 2, because a narrowed vessel lets more blood through
   • Case 1, because a widened vessel is nearer the heart
   • Case 2, because blood is squeezed through a narrow vessel faster

10. Heart chambers card (textbook facts)

    chamber	blood comes from	blood goes to
    right atrium	the body	the right ventricle
    right ventricle	the right atrium	the lungs
    left atrium	the lungs	the left ventricle
    left ventricle	the left atrium	the body

11. 8.

    Ren reads the heart chambers card. According to the card, where does the left ventricle send blood?

    • To the right ventricle
    • To the left atrium
    • To the lungs
    • To the body

12. Vessel width card (model data)

    vessel setting	width	blood flow
    narrowed	smaller	less blood flows through
    widened	larger	more blood flows through

13. 9.

    Tala reads a card about a vessel that takes blood to a muscle. According to the card, what happens to blood flow when the vessel is widened?

    • More blood flows through it
    • Blood flows backward through it
    • Less blood flows through it
    • The same amount flows through it

14. Rest and jog card (model data)

    activity	heart rate (beats per minute)	breathing rate (breaths per minute)
    resting	75	14
    jogging	120	28

15. 10.

    Zee reads a card of heart rate and breathing rate. According to the card, how fast is the heart rate while jogging?

    • 75 beats per minute
    • 120 beats per minute
    • 28 beats per minute
    • 14 beats per minute