Grade 6 Science & Technology · Strand 1: Living things and the Environment · Human Circulatory System
Blood Components Plasma and Red Blood Cells
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. Which part of human blood is the pale, straw-coloured liquid that carries dissolved nutrients, hormones and wastes?
- A. Plasma
- B. Platelets
- C. Red blood cells
- D. White blood cells
2. Why is the biconcave shape of a red blood cell useful?
- A. It gives a large surface area so oxygen can diffuse in and out quickly
- B. It lets the cell hold a large nucleus
- C. It helps the cell fight germs
- D. It helps the blood to form clots
3. Wanjiru's blood test shows she lacks iron. Which part of her red blood cells is most affected, and what is the likely result?
- A. Haemoglobin, so less oxygen is carried and she feels tired
- B. Plasma, so her blood becomes too thick
- C. Platelets, so her blood cannot clot
- D. The nucleus, so her cells cannot divide
4. Which statement correctly describes how oxygen and carbon dioxide are mostly transported in the blood?
- A. Oxygen is carried by haemoglobin in red blood cells; carbon dioxide is mostly carried in plasma
- B. Oxygen is carried in plasma; carbon dioxide is carried by haemoglobin
- C. Both gases are carried only by white blood cells
- D. Both gases are carried only by platelets
5. Name the iron-rich protein inside red blood cells that binds to oxygen in the lungs.
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