P3 Science · Chapter 9brightbit.net/worksheets
The Human Body — Respiratory & Circulatory Systems
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
What is the main function of the respiratory system?
(a) To bring oxygen into the body and remove carbon dioxide(b) To pump blood around the body(c) To digest food(d) To filter waste from the blood
- 2.
Which organ is responsible for gas exchange in the human body?
(a) Lungs(b) Heart(c) Kidneys(d) Liver
- 3.
What is the role of the diaphragm in breathing?
(a) It contracts and relaxes to change the volume of the chest cavity(b) It filters air entering the lungs(c) It pumps blood to the lungs(d) It absorbs oxygen from the air
- 4.
The main function of the heart is to:
(a) Pump blood around the body(b) Produce blood cells(c) Filter waste from blood(d) Supply oxygen to the lungs
- 5.
Blood carries oxygen from the lungs to all body cells. What does it carry back from the cells to the lungs?
(a) Carbon dioxide(b) Glucose(c) Oxygen(d) Water only
- 6.
Which blood vessel carries blood AWAY from the heart?
(a) Artery(b) Vein(c) Capillary(d) Aorta only
- 7.
What happens to your breathing rate when you exercise?
(a) It increases because muscles need more oxygen(b) It decreases(c) It stays the same(d) It stops temporarily
- 8.
What is the name of the tiny air sacs in the lungs where gas exchange takes place?
(a) Alveoli(b) Bronchi(c) Trachea(d) Capillaries
- 9.
Name the tube that carries air from the mouth and nose down to the lungs.
Answer: ____________________________________
- 10.
The circulatory system works together with the respiratory system. How?
(a) Blood transports the oxygen picked up by the lungs to all body cells(b) The lungs pump blood around the body(c) The heart produces oxygen for the lungs(d) The circulatory system digests food for the lungs
Answer key — P3 Science: The Human Body — Respiratory & Circulatory Systems
For parents. Step-by-step explanations for every question are free on brightbit.net.
- 1.(a) To bring oxygen into the body and remove carbon dioxide
- 2.(a) Lungs
- 3.(a) It contracts and relaxes to change the volume of the chest cavity
- 4.(a) Pump blood around the body
- 5.(a) Carbon dioxide
- 6.(a) Artery
- 7.(a) It increases because muscles need more oxygen
- 8.(a) Alveoli
- 9.Trachea
- 10.(a) Blood transports the oxygen picked up by the lungs to all body cells
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