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?

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

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 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.

3. 2.

   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?

   • Vena cava, the vessel that returns blood to the right atrium
   • 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
4. 3.

   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 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
   • The left ventricle, the pump on the left side
5. 4.

   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 right atrium, the chamber that receives blood
   • The left ventricle, the pump for the body
   • The right ventricle, the pump for the body
6. 5.

   Two maps (model, not to scale). Milo compares two maps of where blood goes after it leaves the heart. Which case shows how a person's heart really sends blood to the lungs?

   • Case P, because the right ventricle has the strongest muscle
   • Case Q, because the lungs sit on the left side of the heart
   • Case Q, because the left ventricle pumps blood to the lungs
   • Case P, because the right ventricle pumps blood to the lungs
7. 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 1, because one loop is enough to reach the lungs and body
   • Case 1, because blood goes from the heart to the body and back
   • Case 2, because the lungs make the oxygen that the body needs
   • Case 2, because blood visits the lungs and then the body
8. 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 2, because a narrowed vessel lets more blood through
   • Case 1, because a widened vessel is nearer the heart
   • Case 1, because a widened vessel lets more blood through
   • Case 2, because blood is squeezed through a narrow vessel faster

9. 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

10. 8.

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

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

11. Vessel width card (model data)

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

12. 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?

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

13. Rest and jog card (model data)

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

14. 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
    • 14 beats per minute
    • 28 beats per minute