Lung Structure and Blood Circulation Explained

The video explains the structure and function of the lungs, detailing how air travels through the trachea into the bronchi and alveoli, where oxygen is exchanged for carbon dioxide. It describes the blood flow from the lungs to the heart and throughout the body, highlighting the role of capillaries in nutrient and waste exchange. The video concludes with a brief mention of the respiratory cycle and a preview of the next video on heart function.

How many lobes does the right lung have?

• Two

• One

• Three

• Four

What is the function of the trachea?

• To filter waste

• To digest food

• To carry air into the lungs

• To pump blood

What are the tiny air sacs at the end of the airways called?

• Bronchi

• Alveoli

• Capillaries

• Veins

What waste gas is released into the bloodstream by cells?

• Carbon Dioxide

• Oxygen

• Hydrogen

• Nitrogen

Through which veins does oxygen-rich blood travel from the lungs to the heart?

• Coronary veins

• Femoral veins

• Pulmonary veins

• Jugular veins

Which valve opens to allow blood from the left atrium to the left ventricle?

• Aortic valve

• Tricuspid valve

• Pulmonary valve

• Mitral valve

What connects small artery branches to small veins in the body?

• Bronchi

• Veins

• Arteries

• Capillaries

What is the primary function of capillaries?

• To filter blood

• To store oxygen

• To deliver nutrients and oxygen to cells

• To produce blood cells

Where does deoxygenated blood go after passing through the capillaries?

• To the kidneys

• To the lungs

• To the left atrium

• To the liver