Warm Up 12 5/4 Oxygen CO2 During cellular respiration, ____ is used to break down sugar. ATP is produced and _____ is released. The circulatory system works closely with the ___________ system in exchange of oxygen and CO2. What are some structures of the respiratory system?

Respiratory System Function: to bring about the exchange of O2 & CO2 2

3

1. Nose/Nasal Cavity a. filtered by cilia b. moistened by mucus c. warmed by blood 4

2. Pharynx (throat) Larynx (voicebox) Trachea (windpipe) Epiglottis- flap of cartilage above larynx closes when swallowing 5

3. Bronchi a. 2 large passageways to lungs b. Subdivide to bronchioles c. Ends in millions of tiny air sacs alveoli surrounded by capillaries 6

4. Gas Exchange by diffusion 350million alveoli hemoglobin binds w/O2 7

Breathing Inhalation Exhalation 8

How Breathing is Controlled Medulla oblongata Nerve impulses cause diaphragm to contract More CO2, faster you breathe 9

Diseases Bronchitis- bronchi become swollen & clogged with mucus

Emphysema- loss of elasticity, damaged alveoli

Lung cancer- Deadly because cells spread to dozens of other places Accounts for about 27% of all cancer deaths and is by far the leading cause of cancer death among both men and women. Each year, more people die of lung cancer than of colon, breast, and prostate cancers combined.

What are the 3 things that happen as air goes through the nasal cavity? What is the pharynx, larynx, and trachea?

Bronchi Trachea Brionchioles Nose mouth Larynx Pharynx Lung Alveoli Diaphragm