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Lungs and Respiratory system How do we get oxygen into the body?
Why do we need oxygen? • Aerobic cells need oxygen to make energy • (remember the yeast lab?)
Human Respiratory system • Path of oxygen: • Mouth/nose pharynx larynx trachea bronchi lung • Lungs have these parts: • Bronchi bronchioles alveoli
Nose • Function: prevent dust from getting into the lungs. • Structures: • Hair traps dust • Mucus traps dust
Pharynx (again!) • Function: prevent food getting into the lungs • Structure: epiglottis, flap, closes when you swallow
Larynx • Function: speaking • Structure: contains the vocal cords
trachea • Function: passage of air • Structure: surrounded by cartilage
Bronchi • Function: passage of air • Two tubes that split from the trachea
Bronchioles • Function: passage of air • Structure: separates into smaller branches
alveoli • Function: site of gas exchange • Structure: very thin walls, surrounded with capillaries. • Gas is carried in the blood by hemoglobin in RBC’s
Breathing • The diaphragm is the muscle responsible for breathing • When it contracts it expands the chest cavity. Negative pressure pulls air into the lungs • http://www.youtube.com/watch?v=hp-gCvW8PRY
Breathing • Breathing is controlled not by how much oxygen you have but by much CO2 is in your blood. • What can you do to hold your breath longer?