Science Kids: The Amazing Circulatory System

What are the main components of the circulatory system?

• Heart, liver, and lungs

• Heart, blood, and blood vessels

• Lungs, veins, and arteries

• Brain, heart, and blood

Where are red blood cells produced in the body?

• In the brain

• In the lungs

• In the bones

• In the skin

How many chambers does the human heart have?

• Five

• Four

• Three

• Two

What is the primary function of the heart in the circulatory system?

• To produce oxygen

• To pump blood

• To digest food

• To filter waste

What is the sound of a heartbeat primarily caused by?

• Blood flowing through veins

• Valves opening and closing

• Heart muscle contracting

• Blood entering the lungs

Which blood vessels carry oxygen-rich blood away from the heart?

• Valves

• Arteries

• Capillaries

• Veins

What is the function of capillaries in the circulatory system?

• To produce red blood cells

• To connect arteries and veins

• To store oxygen

• To transport nutrients

What is the main role of plasma in the blood?

• To clot blood

• To carry oxygen

• To fight infections

• To transport blood components

What is the primary function of platelets in the blood?

• To carry nutrients

• To fight infections

• To help blood clot

• To transport oxygen

How do white blood cells help maintain health?

• By growing new cells

• By transporting nutrients

• By defending against infections

• By producing oxygen