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Respiatory Systemon 19 December 2010
Transcript of Respiratory System
Alveoli The nose allows air to move through the nose to the back of the mouth called the pharynx The Nose The Pharynx The pharynx is a passageway for air and food. Air moves from the pharynx through larynx into the trachea. Larynx The larynx passes air through the trachea.
The larynx also contains elastic fold of tissues called vocal cords. When muscles pull the vocal cords air moves between them to vibrate and make sounds. Trachea Cartilage called epiglottis covers the entrance to the trachea.
The trachea is the tube that takes the air from the larynx into two passageways in the lungs called the bronchi. Bronchi Each bronchus leads to one of the two lungs. In each lung the large bronchi subdivides into smaller bronchi, which leads to smaller passageways called bronchioles. Bronchioles keep subdivide until they are millions of tiny air sacs called alveoli. Alveoli Alveoli are grouped in little clusters. Thin-walled capillaries surround each alveolus.
When you inhale, air fills the alveoli and oxygen passes from the alveoli through a semipermeable membrane and into the capillaries, leading into the bloodstream. Lungs The lungs store the body's oxygen and pump air throughout the body.
They also contatin passageways called bronchi.
Ribs surround the lungs to protect them and other organs. They also give structure to the body. When you breathe through your nose you capture more air rather than breathing through your mouth.
The nasal cavity cleans, moisturizes, and warms the air that enters
Diseases and Disorders Asthma
Lung Cancer Asthma When asthma occurs broncholes in the lungs become inflamed
and wheezing. Emphysema Emphysema-Caused by
over-inflation in the alveoli Lung Cancer Lung Cancer-Most common type of cancer
Kills more then most other cancers
Mostly caused by smoking and radiation What is the respiratory system? The system for giving off carbon dioxide and taking in oxygen. Breathing Process Breathing is movement of air into and out of the lungs. The lungs are two sealed in two sacs called the pleural membranes. At the bottom of the chest cavity is the diaphram; by inhaling or exhaling the diaphram contracts and expands the chest cavity. The lungs are then filled with air that rushes into the breathing passages. Effects of Smoking Smoking causes respiratory diseases such as chronic bronchitis emphysema, and lung cancer. What Happens between the alveoli and capillaries? Gases are exchanged between the alveoli
and the surrounding capillaries Air fills the alveoli when you inhale. Oxygen passes from the alveoli into the bloodstream then carbon dioxide is pushed out of the blood.