The circulatory and respiratory systems working together

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 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.

2. 1.

   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?

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

3. 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.

4. 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
   • Pulmonary artery, because arteries carry oxygen-rich blood
   • Aorta, the vessel that carries oxygen-rich blood to the body
   • Pulmonary vein, the vessel that returns blood to the left atrium
5. 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 left ventricle, the pump on the left side
   • The body, where blood goes right after it leaves the heart
   • The right atrium, the chamber that fills first
   • The lungs, where oxygen enters the blood
6. 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 left ventricle, the pump for the body
   • The right ventricle, the pump for the body
   • The right atrium, the chamber that receives blood
   • The lungs, which make the oxygen the body needs
7. 5.

   Map of blood flow (model, not to scale). Luz fills in the map. After the body, oxygen-poor blood travels in the blank box back to the right atrium. What belongs in the blank box?

   • Veins, the vessels that carry blood toward the heart
   • Arteries, the vessels that carry blood toward the heart
   • Capillaries, the vessels that carry blood toward the heart
   • Nothing, because the blood stays in the body
8. 6.

   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 Q, because the lungs sit on the left side of the heart
   • Case P, because the right ventricle pumps blood to the lungs
   • Case P, because the right ventricle has the strongest muscle
   • Case Q, because the left ventricle pumps blood to the lungs
9. 7.

   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 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
10. 8.

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

11. 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

12. 9.

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

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

13. Vessel width card (model data)

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

14. 10.

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