SISTEM peredaran darah

After oxygen-rich red blood cells leave the lungs, which blood vessel do they enter to reach the heart?

• Aorta

• Pulmonary Artery

• Pulmonary Vein

• Capillary

Approximately how many times does the human heart beat in a day?

• 1,000 times

• 10,000 times

• 100,000 times

• 1,000,000 times

What is the largest blood vessel in the human body?

• Artery

• Vein

• Capillary

• Aorta

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What waste product do cells produce after consuming necessary substances and generating energy?

• Oxygen (O2)

• Carbon Dioxide (CO2)

• Nitrogen (N2)

• Water (H2O)