SCIENCE 9 - REVIEW

What is the main organ of the respiratory system?

• Heart

• Lung

• Stomach

• Kidney

Which tube connects the throat to the lungs?

• Esophagus

• Artery

• Trachea

• Vein

What is the main function of the respiratory system?

• Pump blood

• Break down food

• Deliver oxygen and remove carbon dioxide

• Help in digestion

Which gas do we breathe out?

• Oxygen

• Hydrogen

• Carbon dioxide

• Nitrogen

What happens to your diaphragm when you inhale?

• It relaxes and rises

• It contracts and flattens

• It stays still

• It breaks down

How do the respiratory and circulatory systems work together?

• They help in digestion

• They clean the kidneys

• They move oxygen from the lungs to the blood

• They build strong bone

Which organ pumps blood throughout the body?

• Lung

• Kidney

• Heart

• Liver

What is the main function of the circulatory system?

• To help in breathing

• To break down food

• To transport oxygen and nutrients

• To make us move

Why is the heart important in our body?

• It helps us breathe

• It digests food

• It pumps blood to the body

• It cleans the lungs

What carries oxygen and nutrients to the body?

• Air

• Bones

• Blood

• Muscles