BIOLOGY - Physiology - Respiratory System

The video explains the human respiratory system, detailing how it extracts oxygen and expels carbon dioxide. It follows the journey of an oxygen molecule from inhalation through the trachea, bronchi, and alveoli, where gas exchange occurs. The video also discusses the body's defense mechanisms, such as cilia and mucus, to protect the lungs. It highlights potential respiratory issues like asthma and pneumonia and describes medical procedures like bronchoscopy for diagnosing lung problems.

What is the primary function of the respiratory system?

• To digest food

• To extract oxygen and expel carbon dioxide

• To circulate blood

• To produce energy

Through which part of the respiratory system does an oxygen molecule first enter?

• Alveoli

• Trachea

• Mouth or nose

• Bronchioles

How many times do humans typically breathe per minute?

• 5 to 8 times

• 12 to 16 times

• 30 to 35 times

• 20 to 25 times

What role do cilia play in the respiratory system?

• They absorb carbon dioxide

• They waft mucus up to the mouth

• They trap oxygen molecules

• They produce mucus

What is a bronchoscopy used for?

• To look for signs of inflammation or bleeding in the airways

• To measure lung capacity

• To remove mucus from the lungs

• To increase oxygen intake