Grade 9 Review Science

What organ is responsible for pumping blood throughout the body?

• Brain

• Lungs

• Heart

• Kidney

What is the primary function of red blood cells?

• Fight infection

• Clot blood

• Transport oxygen

• Digest food

Which part of the respiratory system is known as the "voice box"?

• Pharynx

• Epiglottis

• Larynx

• Bronchi

Which blood vessels carry blood away from the heart?

• Veins

• Arteries

• Capillaries

• Venules

What gas is taken in during inhalation?

• Carbon dioxide

• Nitrogen

• Oxygen

• Helium

Which structure connects the trachea to the lungs?

• Alveoli

• Bronchi

• Diaphragm

• Larynx

What is the flap of cartilage that prevents food from entering the trachea?

• Pharynx

• Bronchus

• Epiglottis

• Larynx

What muscle aids in breathing by contracting and relaxing?

• Lungs

• Trachea

• Diaphragm

• Alveoli

What part of the blood helps in clotting?

• Plasma

• White blood cells

• Red blood cells

• Platelets

What is the main site of gas exchange in the lungs?

• Trachea

• Alveoli

• Bronchi

• Capillaries