The main organ of the Respiratory System is/are the ___________.

• heart

• stomach

• kidneys

• lungs

When you inhale, you take in __________.

• carbon dioxide

• oxygen

• methane

• helium

The long tube connecting your throat to the lungs is called the _________.

• heart

• voice box

• trachea

• carbon dioxide

The human heart beats between _________ and __________ times every minute.

• 100 and 200

• 50 to 70

• 80 to 100

• 80 to 120

The right side of the heart receives blood from the lungs and return it to the body.

• True

• False

The blood vessels that carry the blood away from the heart are called ________.

• veins

• lungs

• ventricles

• arteries

Which is NOT an organ belonging to the Digestive System?

• small intestine

• esophagus

• large intestine

• arteries

Where does digestion begin?

• in the small intestine

• in the stomach

• in the mouth

• in the large intestine

Where does the food go after it leaves the stomach?

• the esophagus

• the large intestine

• the stomach

• the small intestine

The heart is part of what system?

• Digestive System

• Respiratory System

• Circulatory System

• Nervous System