The Respiratory System

The video tutorial explains the process of breathing, starting with air entering the body through the nose or mouth. It describes how air is cleaned and processed in the nasal cavity, travels through the pharynx and larynx, and is protected from choking by the epiglottis. The trachea and bronchi are introduced as pathways to the lungs, where gas exchange occurs. The tutorial emphasizes the importance of each component in the respiratory system.

Where does the air first enter the body?

• Through the nose or mouth

• Through the eyes

• Through the ears

• Through the skin

What is the function of the mucous membranes and small hairs in the nasal cavity?

• To digest food

• To pump blood

• To clean, filter, warm, and moisten the air

• To produce sound

What is the role of the epiglottis?

• To help in breathing

• To filter air

• To block the larynx during swallowing

• To produce saliva

What happens when exhaled air vibrates the vocal cords?

• It helps in digestion

• It produces sound for speaking and singing

• It cleans the air

• It filters the air

What is the primary function of the lungs?

• To circulate blood

• To produce hormones

• To exchange gases

• To digest food