General Science - Respiratory System

(09-22-2025)

Respiratory System

Its main function is to exchange oxygen from the air with carbon dioxide from the blood.

Nasal Cavity

Air entering the respiratory system generally travels first into the _____ ______, wherein it is warmed, moistened and filtered.

Mucous membrane

The ____ ______ lining in the nasal cavity secretes sticky mucus that traps dust particles and other foreign substances found in the air.

Nares

either of two external openings of the nasal cavity

Olfactory Nerves

The nerves for our sense of smell

Pharynx

our throat

Larynx

our voice box

Epiglottis

A doorway; which separates the wind pipe and the esophagus.

Trachea

a long, U-shaped tube that connects your larynx (voice box) to your lungs.

Windpipe

The trachea is often called the _______.

Bronchi

Large tubes that connect to your trachea (windpipe) and direct the air you breathe to your right and left lungs

Lungs

Located in the chest. It is a large, spongy organs of the respiratory system.

Alveoli

Tiny air sacs. It allows the exchange of oxygen and carbon dioxide between blood and the air

Diaphragm

Dome-shaped. It is the muscle that helps you breathe by contracting to create more space in your thoracic cavity.

Relaxed

When we exhale; the diaphragm is ______.