Grade 6 Science & Technology · Strand 1: Living things and the Environment · Human Circulatory System
Capillaries & Vessels
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. Why is the wall of a capillary only one cell thick?
- A. To make the shortest possible distance for diffusion
- B. To withstand very high blood pressure
- C. To stop blood flowing backwards
- D. To pump blood towards the heart
2. Which of these blood vessels contain valves to stop blood flowing backwards?
- A. Arteries
- B. Veins
- C. Capillaries
- D. Arteries and capillaries
3. Which two substances diffuse out of the blood in the capillaries into the body cells?
- A. Carbon dioxide and urea
- B. Oxygen and glucose
- C. Carbon dioxide and glucose
- D. Oxygen and urea
4. Wanjiru runs hard during a PE lesson and her cheeks turn red. What is happening in her skin capillaries?
- A. They grow valves to stop backflow
- B. They widen to let heat escape from the body
- C. They become one cell thicker to keep heat in
- D. They close completely so blood stops flowing
5. What name is given to the small vessels that receive blood as capillaries join together?
Type your answer in the lesson.
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