1. Respiratory System
2.2 Notes Part 3

2. What is it for? Breathe in oxygen, breathe out carbon dioxide
Lungs important organs

3. Order Air Travels to Your Lungs
Nasal Cavity- air is warmed and filtered by tiny hairs, called cilia, and mucus in your nose. The cilia and mucus trap dirt and other particles - back out the nostril or down into the digestive system
Pharynx
Epiglottis
Larynx- (Voice Box.) It contains your vocal cords. Which vibrate when air passes through them creating your voice
Esophagus
Trachea- Made up of C-shaped bands of cartilage that maintains the tubular shape
Bronchi- Air passes through these tubes and goes directly to the lungs
Lungs- Goes to tiny, thin- walled sacs called the alveoli. Where gas exchange takes place

5. Gas Exchange in the Alveoli
Alveolus surrounded by capillaries
Carbon dioxide diffuses into the alveolus, and oxygen diffuses the other way into the capillaries and binds with the red blood cells
The oxygenated blood returns to the heart to be pumped to the rest of the body
This entire process is called gas exchange

6. Smoking
Many respiratory diseases such as lung cancer and emphysema results from smoking tobacco products
Emphysema causes the alveoli walls to lose their elasticity, making breathing extremely hard as the disease progresses
Often people who have respiratory diseases also have a heart disease.

8. What is in a cigarette?
Smoking is the number one cause of lung cancer; there are over 4000 chemicals in a cigarette.
50 are carcinogenic (Cancer- causing)
Top six most harmful chemicals in a cigarette are nicotine, tar, carbon monoxide, formaldehyde, hydrogen cyanide, and benzene
Smoking also destroys the cilia lining your respiratory

10. Homework Textbook Questions P. 95 #1-15 +18
Circulatory System stuff 1-6, 11, 13, 15
Respiratory Stuff , 12, 14, 18