The Human Respiratory System

Purpose Gas Exchange The lungs take in oxygen and let out Carbon Dioxide Gas Exchange takes place between the lungs and capillaries

Important Parts The Respiratory system consists Nose (Mouth) Pharynx Larynx Trachea Bronchi Lungs (Bronchial tubes/Bronchioles) (Alveoli)

Nose/Mouth Nose Mouth

Nose/Mouth Air moves from the nose to mouth and throat This is a passageway for both air and food As the air is taken in it is warmed up before traveling through the rest of the system

Pharynx and Larynx Nose Mouth Pharynx Larynx

Pharynx and Larynx After the air is warmed its moves from the throat to the pharynx The air than travels into the larynx

Larynx The vocal cords are two highly elastic folds of tissue in the larynx Muscles pull together Air causes the cords to vibrate and sound comes out

Laryngectomy

Trachea Nose Mouth Pharynx Larynx Trachea

Trachea A flap of tissue called the epiglottis covers the entrance to the trachea when you swallow Held open by horseshoe shaped rings of cartilage. The Trachea branches off into two large passageways called the bronchi Each leads to a lung on each side of the chest

Tracheotomy

Bronchi Nose Mouth Pharynx Larynx Trachea R. Bronchus L. Bronchus

Bronchi In each lung, the bronchi are divided into small tubes called bronchioles (***If a piece of food accidentally gets past the epiglottis, it will most likely fall into the right bronchus.***) The left one has a sharper bend due to the presence of the heart and major blood vessels directly underneath it.

Bronchial Tubes/Bronchioles Nose Mouth Pharynx Larynx Trachea R. Bronchus L. Bronchus Bronchioles

Alveoli Alveoli are at the ends of the bronchioles and are tiny air sacs that bunch together like a bunch of grapes Each alveoli are surrounded by a bunch of capillaries that is the place of gas exchange between the lungs and blood

Alveoli Nose Mouth Pharynx Larynx Trachea R. Bronchus L. Bronchus Bronchioles Alveoli

Alveoli

Lung Health The hairs that line the nasal passageway trap large dust particles Cells produce a think layer of mucus that traps inhaled particles Cilia in the lungs sweep trapped particles and mucus away

Gas Exchange Oxygen diffuses in the moisture on the inner surface of the alveoli and then diffuses across the capillaries into the blood Carbon dioxide in the blood diffuses in the opposite direction Air in has 21% oxygen, .04 % CO2 Air out has 15% oxygen and 4% CO2

Breathing Lungs have no muscles attached to them A large, flat muscle at the bottom of the chest cavity is called the diaphragm controls the process

Diaphragm Nose Mouth Pharynx Larynx Trachea R. Bronchus L. Bronchus Bronchioles Alveoli Diaphragm

Breathing When you inhale the diaphragm contracts and expands the volume of the chest cavity This creates a vacuum and the lungs are forced to expand pulling in air Breathing is controlled by the amount of CO2 in the blood, not O2

Breathing

Diseases Emphysema is caused by loss of elasticity of the lungs-hard to breathe Bronchitis is the bronchi being swollen and clogged with mucus Lung Cancer is particular deadly because it spreads to other locations

Other diseases Pneumonia: alveoli become filled with fluid Tuberculosis: bacterial infection of lungs that can cause a hole in the lungs

The Respiratory System Nose Mouth Pharynx Larynx Trachea R. Bronchus L. Bronchus Bronchioles Alveoli Diaphragm