This video explains the journey of air and oxygen into the lungs. It begins with the brainstem signaling the diaphragm to move, allowing the lungs to expand and air to enter through the nose and mouth. The nasal passages filter the air using cilia and mucus. The air then travels through the pharynx and larynx, where the voice box is located. The epiglottis ensures air enters the trachea, which leads to the bronchi and eventually the alveoli, where oxygen and carbon dioxide are exchanged. This process repeats continuously. The video concludes with a prompt to subscribe for more educational content.

What initiates the journey of oxygen into the lungs?

• The heart sending a signal to the lungs

• The brainstem sending a message to the diaphragm

• The lungs expanding on their own

• The nose detecting oxygen levels

What role do the cilia and mucus in the nasal passages play?

• They filter out dirt and pollen from the air

• They increase the speed of air entering the lungs

• They assist in swallowing food

• They help in producing sound

Where does the air go after passing through the pharynx?

• Into the stomach

• Into the bloodstream

• Into the larynx

• Directly into the lungs

What is the function of the epiglottis during breathing?

• It vibrates to produce sound

• It filters out dust particles

• It closes to allow air in

• It opens to allow air in

What is the trachea primarily made of?

• Bone

• Muscle

• Fat

• Cartilage

What are the two tubes that the trachea leads into called?

• Nasal passages

• Alveoli

• Bronchioles

• Left and right bronchus

Where does oxygen diffuse into the bloodstream?

• In the trachea

• In the nasal passages

• In the alveoli

• In the larynx

What happens to carbon dioxide in the alveoli?

• It is converted into oxygen

• It is exhaled out of the body

• It is stored for later use

• It is absorbed into the bloodstream