Human body: The Respiratory System

The video explains the respiratory system, detailing how it allows oxygen into the blood and expels carbon dioxide. It covers the path of air from the nose through the nasal cavity, trachea, and into the lungs. The structure of the lungs, including bronchi, bronchioles, and alveoli, is described, highlighting the gas exchange process. The video also touches on the role of the larynx and vocal cords in producing sound.

What is the primary function of the diaphragm in the respiratory system?

• To filter dust and particles from the air

• To contract and help the lungs pull in air

• To produce sound by vibrating

• To exchange gases in the alveoli

Which part of the respiratory system is responsible for filtering, warming, and moistening the air?

• Bronchioles

• Nasal cavity

• Diaphragm

• Trachea

What are the tiny air sacs in the lungs where gas exchange occurs called?

• Vocal cords

• Alveoli

• Capillaries

• Bronchi

How do capillaries facilitate the exchange of gases in the lungs?

• By vibrating to produce sound

• By lining up blood cells single file for gas exchange

• By contracting to pull in air

• By filtering dust and particles

What happens when the vocal cords partially close during exhalation?

• They contract to pull in air

• They exchange oxygen and carbon dioxide

• They filter the air

• They vibrate to produce sound