What is the main function of the heart?

• Storing oxygen

• Pumping blood

• Filtering blood

• Producing hormones

Which blood vessel carries oxygen-poor blood to the heart?

• Aorta

• Pulmonary veins

• Vena cava

• Pulmonary artery

What type of blood cells are responsible for fighting infection?

• Platelets

• White blood cells

• Plasma

• Red blood cells

Which chamber of the heart receives oxygen-rich blood from the lungs?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle

What is the largest artery in the body?

• Aorta

• Coronary artery

• Vena cava

• Pulmonary artery

What is the primary function of capillaries?

• Store blood

• Transport blood

• Exchange nutrients and gases

• Pump blood

Which part of the blood is responsible for transporting gases?

• Red blood cells

• Platelets

• Plasma

• White blood cells

What condition is characterized by inadequate oxygen supply to the heart muscles?

• Angina

• Hypertension

• Anemia

• Leukemia

What is the primary role of the diaphragm in respiration?

• Filtering air

• Pumping blood

• Facilitating breathing

• Producing sound

Which structure is known as the main gateway of the respiratory system?

• Bronchi

• Trachea

• Nose

• Larynx