The heart, vessels and blood flow
Grade 7 Science Worksheet
Circle the best answer.
Ari's path reads: body → right atrium → right ventricle → ? → left atrium. What fills the blank?
- Body
- Left ventricle
- Lungs
- Stomach
Bo's path reads: lungs → left atrium → ? → body. What fills the blank?
- Left ventricle
- Right atrium
- Right ventricle
- Lungs again
Esme's path reads: left ventricle → body → ? → right ventricle. What fills the blank?
- Lungs
- Left atrium
- Left ventricle
- Right atrium
Why is the left ventricle's wall thicker than the right's, Kira?
- It pumps blood around the whole body
- It pumps blood just to the lungs
- It stores extra blood
- It makes oxygen
Which side of the heart holds oxygen-poor blood, Luz?
- The right side
- Both sides equally
- The left side
- Neither side
Why are capillaries good places for things to pass between blood and cells, Noah?
- They are as wide as arteries
- Their walls are the thickest in the body
- Their walls are one cell thick
- They have no blood in them
Arteries have thick, muscular walls. What is that thick wall good for, Pia?
- Bringing blood back to the heart
- Making blood
- Carrying blood pushed hard from the heart
- Letting oxygen pass out to cells
Ren bikes up a hill, and the heart beats faster. Why does it beat faster?
- To make more oxygen in the heart
- To skip the lungs
- To send less blood to the muscles
- To send more blood to the muscles
During a race, vessels to Tala's leg muscles widen. What does that do?
- Blood stops in the legs
- Less blood reaches the leg muscles
- More blood reaches the leg muscles
- Blood goes back without the lungs
After a hard game, Zee breathes fast and the heart beats fast. How do the two systems work together?
- Lungs load oxygen; the heart pumps it out
- They work apart
- The left side sends blood to the lungs
- The heart makes oxygen; the lungs pump it