The Heart and How It Works

Fill in the Blank: Fill in the blank with the correct words. Blood flows from the right atrium to the right _.

• atrium

• ventricle

• aorta

• pulmonary artery

Fill in the Blank: Fill in the blank with the correct words. The heart has special doors called _.

• valves

• gates

• windows

• doors

Fill in the Blank: Fill in the blank with the correct words. The tricuspid valve and the mitral valve are _ of the heart.

• valves

• chambers

• arteries

• muscles

Fill in the Blank: Fill in the blank with the correct words. The _ is the strongest part of the heart.

• ventricle

• atrium

• septum

• aorta

Fill in the Blank: Fill in the blank with the correct words. The heart has three layers: endocardium, _, and pericardium.

• myocardium

• epicardium

• pleura

• peritoneum

What is the main job of the heart?

• To sing

• To pump blood

• To jump

Where does the blood go after it leaves the right ventricle?

• To the brain

• To the lungs

• To the stomach

What keeps the blood from flowing backward?

• The heartbeats

• The valves

• The toes

Which part of the heart is known for being very strong?

• The atrium

• The myocardium

• The skin

How many layers does the heart have?

• One

• Three