P5 Science · Chapter 8brightbit.net/worksheets
Circulatory System
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- 1.
What are the main components of the circulatory system?
(a) Heart, lungs, and kidneys(b) Heart, blood vessels, and blood(c) Heart, stomach, and blood(d) Lungs, blood vessels, and kidneys
- 2.
What is the function of red blood cells?
(a) Fight infections(b) Carry oxygen around the body(c) Help blood to clot(d) Carry nutrients from digestion
- 3.
What is the difference between arteries and veins?
(a) Arteries carry blood to the heart; veins carry blood away(b) Arteries carry blood away from the heart; veins carry blood to the heart(c) Both carry blood away from the heart(d) Arteries carry only oxygenated blood; veins carry only deoxygenated blood
- 4.
What is the role of white blood cells?
- 5.
What are platelets and what do they do?
(a) Carry oxygen in the blood(b) Carry carbon dioxide away from cells(c) Help blood to clot at the site of a wound(d) Produce antibodies
- 6.
What is plasma and what does it transport?
- 7.
Why does the heart have four chambers?
(a) To produce blood cells(b) To keep oxygenated and deoxygenated blood separate for efficient circulation(c) To filter waste from the blood(d) To store blood during rest
- 8.
Why do capillaries have very thin walls?
- 9.
Why does the left ventricle have a thicker muscular wall than the right ventricle?
(a) It pumps blood a shorter distance(b) It pumps blood to the entire body so needs more force(c) It produces more blood(d) It receives blood from the lungs
- 10.
Regular exercise strengthens the heart. How does this benefit the circulatory system?
Answer key — P5 Science: Circulatory System
For parents. Step-by-step explanations for every question are free on brightbit.net.
- 1.(b) Heart, blood vessels, and blood
- 2.(b) Carry oxygen around the body
- 3.(b) Arteries carry blood away from the heart; veins carry blood to the heart
- 4.White blood cells defend the body against infections by engulfing pathogens or producing antibodies
- 5.(c) Help blood to clot at the site of a wound
- 6.Plasma is the liquid component of blood (mainly water) that transports nutrients, hormones, waste products (CO2, urea), and heat
- 7.(b) To keep oxygenated and deoxygenated blood separate for efficient circulation
- 8.Thin walls allow nutrients, oxygen, and waste to diffuse easily between the blood and surrounding body cells
- 9.(b) It pumps blood to the entire body so needs more force
- 10.A stronger heart pumps more blood per beat, so the resting heart rate is lower and tissues receive oxygen more efficiently
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