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Cells respiratory system circulatory system

Which organ is responsible for exchanging oxygen and carbon dioxide in the body?
Lungs
Heart
Liver
What is the main function of red blood cells?
Carrying oxygen
Fighting infections
Producing hormones
Which blood vessels carry oxygenated blood away from the heart?
Arteries
Veins
Capillaries
What is the purpose of the diaphragm in the respiratory system?
To help with breathing
To pump blood
To filter air
Which chamber of the heart receives oxygenated blood from the lungs?
Left atrium
Right ventricle
Left ventricle
How does oxygen enter the bloodstream in the respiratory system?
Through the alveoli in the lungs
Through the trachea
Through the bronchi
Which component of blood is responsible for clotting?
Platelets
Red blood cells
White blood cells
What is the purpose of valves in the circulatory system?
To prevent backflow of blood
To regulate blood pressure
To produce red blood cells
How does the respiratory system help maintain pH balance in the body?
By removing carbon dioxide
By producing bicarbonate ions
By regulating heart rate
Which blood vessels have thin walls to allow for the exchange of gases and nutrients?
Capillaries
Arteries
Veins
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