Grade 6 Science & Technology · Strand 1: Living things and the Environment · Human Circulatory System
Heart Valves and Pumping Action
A short Grade 6 Science & Technology lesson for the CBE curriculum, part of Living things and the Environment: Human Circulatory System. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. What is the main job of the valves in the heart?
- A. To pump blood around the body
- B. To make sure blood flows in only one direction
- C. To add oxygen to the blood
- D. To separate the left side from the right side of the heart
2. A doctor listens to a heartbeat with a stethoscope and hears 'lub-dub'. What causes these sounds?
- A. Blood rubbing against the walls of the heart
- B. Heart valves snapping shut
- C. Muscles of the lungs expanding
- D. The atria filling with air
3. Which valve controls the flow of blood from the left atrium into the left ventricle?
- A. Tricuspid valve
- B. Pulmonary valve
- C. Bicuspid (mitral) valve
- D. Aortic valve
4. What word describes the backwards movement of blood when a heart valve fails to close properly?
Type your answer in the lesson.
5. Wanjiru runs across the school field and her heart beats faster. Why does this happen?
- A. Her muscles need more oxygen, so the heart must pump more often
- B. Her valves stop working while she runs
- C. Her heart needs to rest for longer between beats
- D. Her lungs push blood around her body instead of the heart
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