SCIENCE 9 1ST MONTHLY EXAM

What is the primary function of the respiratory system?

• Pump blood

• Digest food

• Exchange gases

• Transport nutrients

Which organ is the main site for gas exchange?

• Bronchi

• Alveoli

• Trachea

• Diaphragm

What gas is inhaled during breathing?

• Carbon dioxide

• Nitrogen

• Hydrogen

• Oxygen

What is the flap of tissue that prevents food from entering the windpipe?

• Larynx

• Epiglottis

• Pharynx

• Trachea

Which of the following is part of the upper respiratory tract?

• Lungs

• Bronchi

• Nasal cavity

• Alveoli

The diaphragm is a:

• Muscle that aids in breathing

• Lung tissue

• Bone in the chest

• Tube for food

Which structure connects the pharynx to the lungs?

• Esophagus

• Bronchioles

• Trachea

• Sinuses

What happens to the diaphragm when you inhale?

• It moves up

• It contracts and flattens

• It expands

• It becomes rigid

What gas is exhaled from the body during respiration?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Which part of the lungs contains the alveoli?

• Bronchi

• Pleura

• Bronchioles

• Trachea