The heart, vessels and blood flow
Grade 7 Science Worksheet
Circle the best answer.
Bo's path reads: lungs → left atrium → ? → body. What fills the blank?
- Right ventricle
- Lungs again
- Left ventricle
- Right atrium
Esme's path reads: left ventricle → body → ? → right ventricle. What fills the blank?
- Right atrium
- Left atrium
- Lungs
- Left ventricle
Read this first
Numbered path, not to scale
1 body → 2 right atrium → 3 right ventricle → 4 lungs → 5 left atrium → 6 left ventricle → 7 body.
Blood in the left ventricle is oxygen-rich. Where did it just come from, Jun?
- The body
- The stomach
- The right ventricle
- The lungs
Why is the left ventricle's wall thicker than the right's, Kira?
- It stores extra blood
- It pumps blood around the whole body
- It makes oxygen
- It pumps blood just to the lungs
Which side of the heart holds oxygen-poor blood, Luz?
- Neither side
- The left side
- The right side
- Both sides equally
During Milo's run, leg muscles need oxygen. Where does oxygen leave the blood and enter the muscle cells?
- In the big arteries
- In the heart
- In the capillaries
- In the veins
Why are capillaries good places for things to pass between blood and cells, Noah?
- They have no blood in them
- Their walls are one cell thick
- They are as wide as arteries
- Their walls are the thickest in the body
Ren bikes up a hill, and the heart beats faster. Why does it beat faster?
- To skip the lungs
- To send less blood to the muscles
- To send more blood to the muscles
- To make more oxygen in the heart
During a race, vessels to Tala's leg muscles widen. What does that do?
- More blood reaches the leg muscles
- Blood goes back without the lungs
- Blood stops in the legs
- Less blood reaches the leg muscles
After a hard game, Zee breathes fast and the heart beats fast. How do the two systems work together?
- The left side sends blood to the lungs
- They work apart
- The heart makes oxygen; the lungs pump it
- Lungs load oxygen; the heart pumps it out