Understanding the Circulatory System

Fill in the blank: Blood is the fluid used by the circulatory system to carry ______ to every part of your body.

• Air

• Materials

• Cells

• Muscles

The main organ of the circulatory system is the ______.

• Brain

• Heart

• Lungs

• Liver

The heart is about the size of a ______.

• Apple

• Fist

• Football

• Orange

What does the right side of the heart do?

• Pumps oxygen-rich blood to the body

• Receives blood carrying wastes and sends it to the lungs

• Pumps blood to the brain

• Receives oxygen-rich blood from the lungs.

What is the function of the valves in the heart?

• To pump blood

• To prevent backflow of blood

• To oxygenate blood

• To filter blood.

Blood enters the heart through the ______.

• Ventricles

• Valves

• Atriums

• Arteries

What is the top-right chamber of the heart called?

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

The heart can change how much blood it pumps with each ______.

• Beat

• Minute

• Hour

• Day

Tags

CCSS.L.9-10.4

CCSS.RI.9-10.4

The left side of the heart collects ______ blood from the lungs.

• Oxygen-poor

• Oxygen-rich

• Carbon dioxide-rich

• Nutrient-rich

What is the main function of veins?

• To carry blood to the heart

• To carry blood away from the heart

• To oxygenate blood

• To store blood