the tube that connects the throat and bronchi

Components in the respiratory system allow for protection from foreign material these include mucus production in the lungs and cilia in the bronchi and bronchioles to move matter out of the system.As air moves out of the nasal cavity, it moves into the pharynx, larynx, trachea, the primary bronchi (right and left lung), secondary and tertiary bronchi, bronchioles, then alveolar sacs where gas exchange occurs with the capillaries.The air that moves from the external environment into the body pass through the nasal cavity where it is warmed, humidified, and surveyed for particulates.This ensures that oxygen will diffuse from alveoli into the blood and that carbon dioxide produced by cells as a waste product will diffuse from the blood into alveoli to be exhaled.īelow the lungs is the diaphragm, which contracts and relaxes to facilitate inhaling and exhaling. Alveoli are made of thin-walled, parenchymal cells that are in direct contact with capillaries of the circulatory system. This Y is often called the bronchial tree. The trachea and bronchi airways form an upside-down Y in your chest.

Each sac contains 20-30 alveoli that are 200-300 microns in diameter. Each lung has a tube called a bronchus that connects to the trachea. The alveolar ducts are attached to the end of each bronchiole each duct ends in approximately 100 alveolar sacs. The size of the breathing tube is matched to your age and throat size. alveolus) and alveolar sacs surround the alveolar ducts. The trachea, also known as the windpipe, is a tube that carries oxygen to your lungs.

The terminal bronchioles then subdivide into respiratory bronchioles which subdivide into alveolar ducts. Each bronchus divides into secondary, then into tertiary bronchi, which further divide to create smaller diameter bronchioles that split and spread through the lung. As air passes down the trachea to the lungs, it is diverted through bronchi beginning with the two primary bronchi. The larger right lung has three lobes, while the smaller left lung has two lobes. The end of the trachea splits into the right and left lungs, which are not identical. The trachea is lined with mucus-producing goblet cells and ciliated epithelia that propel foreign particles trapped in the mucus toward the pharynx. From the nasal cavity, air passes through the pharynx and the larynx to the trachea. The bronchi then branch into numerous bronchioles and the bronchioles branch and end as air-filled sac known as alveoli.Īir enters the body through the nasal cavity. The respiratory tract starts from the nasal cavity and enters the lungs as bronchi via the trachea. The lungs are the respiratory organs of the body.

The tube that connects the throat and bronchi