The Human Circulatory System

The role of the heart, blood, and blood vessels is to:

• pump blood throughout the body

• digest food

• control the nervous system

• filter waste from the blood

What is the primary function of the heart?

• To digest food

• To pump blood around the body

• To filter waste

• To store energy

How many chambers does the heart have?

• Two

• Three

• Four

• Five

What does the right atrium take in?

• Oxygen-rich blood

• Blood carrying carbon dioxide

• Nutrients

• Waste products

What enters the left atrium?

• Oxygen-carrying blood from the lungs

• Carbon dioxide-rich blood from the body

• Nutrient-rich blood from the liver

• Waste-laden blood from the kidneys

Fill in the blank: Blood is pumped into the left ventricle and starts its journey again throughout the ____.

• body.

• lungs.

• heart.

• brain.

The chamber of the heart that receives oxygenated blood from the lungs is:

• Right Atrium

• Left Atrium

• Right Ventricle

• Left Ventricle

The four main components of blood are red blood cells, white blood cells, platelets, and ______.

• plasma

• hemoglobin

• lymph

• serum

Which component of blood fights diseases and protects the body from infection?

• Red blood cells

• White blood cells

• Platelets

• Plasma

Which type of blood vessel has the thinnest wall to allow substances to pass through?

• A) Artery

• B) Capillary

• C) Vein