B4.3 THE HEART

How many chambers does the heart have?

• 2

• 4

• 6

• 8

What enters the right atrium of the heart?

• Oxygenated blood from the lungs

• Deoxygenated blood from the body

• Deoxygenated blood from the lungs

• Oxygenated blood from the body

What prevents blood from flowing back into the atria?

• atria

• ventricles

• veins

• valves

Which artery carries oxygenated blood from the heart?

• Pulmonary artery

• Pulmonary vein

• Vena cava

• Aorta

What type of circulatory system do humans have?

• Double circulation

• Open circulatory system

• Single circulation

• Closed circulatory system

Where does the pulmonary circulation transport blood to?

• The liver

• The lungs

• The brain

• The heart

What diffuses into the blood from the alveoli?

• Oxygen

• Nitrogen

• Glucose

• Carbon dioxide

Why is the systemic (to the body) circulation under high pressure?

• To pump blood to the lungs only

• To deliver blood to the extremities of the body

• To filter waste products

• To absorb nutrients faster

How many times does blood pass through the heart in one complete circulation of the body?

• Twice

• Three times

• Four times

• Once