Understanding Oxygen and Carbon Dioxide Flow

What is the first structure air passes through during inhalation?

• Alveoli

• Trachea

• Bronchi

• Nasal cavity or mouth

What are the small branches of the bronchi called?

• Lungs

• Trachea

• Bronchioles

• Alveoli

Where does oxygen diffuse into the blood?

• Mouth

• Alveoli of the lungs

• Stomach

• Skin

What molecule does oxygen bind to in red blood cells?

• Hemoglobin

• Myoglobin

• Glucose

• Carbon dioxide

How is oxygen-rich blood transported to the heart?

• Oxygen-rich blood is transported to the heart by the coronary arteries.

• Oxygen-rich blood is transported to the heart through the vena cava.

• Oxygen-rich blood is transported to the heart via the pulmonary veins.

• Oxygen-rich blood is transported to the heart via the aorta.

Which chamber of the heart receives oxygenated blood first?

• Right ventricle

• Left atrium

• Left ventricle

• Right atrium

What is the role of the left ventricle in the circulatory system?

• The left ventricle regulates blood pressure in the heart.

• The left ventricle pumps blood to the lungs for oxygenation.

• The left ventricle pumps oxygenated blood to the body.

• The left ventricle receives deoxygenated blood from the body.

Where does carbon dioxide diffuse from in the body?

• Lungs

• Tissues of the body

• Heart

• Bloodstream

How is carbon dioxide transported to the heart?

• Carbon dioxide is carried to the heart by red blood cells directly.

• Carbon dioxide is transported to the heart mainly as bicarbonate ions in the plasma.

• Carbon dioxide is dissolved in water and transported as a gas.

• Carbon dioxide is transported to the heart as oxygen molecules.

What is the waste product of cellular respiration?

• Carbon dioxide

• Oxygen

• Glucose

• Water