Respiration D. Crowley, 2007. Respiration To know the equation for respiration.
30.2 Respiration and Gas Exchange KEY CONCEPT The respiratory system exchanges oxygen and carbon...
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Transcript of 30.2 Respiration and Gas Exchange KEY CONCEPT The respiratory system exchanges oxygen and carbon...
30.2 Respiration and Gas Exchange
KEY CONCEPT The respiratory system exchanges oxygen and carbon dioxide.
30.2 Respiration and Gas Exchange
NGSSS
•SC.912.L.14.36 Describe the factors affecting blood flow through the cardiovascular system. (MODERATE)
30.2 Respiration and Gas Exchange
Gas exchange occurs in the alveoli of the lungs.
• Oxygen and carbon dioxide are carried by the blood to and from the alveoli.– oxygen diffuses from alveoli into capillary – oxygen binds to hemoglobin in red blood cells – carbon dioxide difuses from capillary into alveoli
ALVEOLI GAS EXCHANGES
capillaries
alveolus
capillary
co2
o2
Co2 diffusesinto alveolus.
O2 diffusesinto blood.
30.2 Respiration and Gas Exchange
• Red blood cells carries carbon dioxide into the lungs• Hemoglobin is an iron-rich protein that allows more
oxygen to enter red blood cells.• Red Blood Cells carries oxygen away from lungs
30.2 Respiration and Gas Exchange
Gas exchange occurs in the alveoli of the lungs.
• Breathing is regulated by the brain stem.
midbrainpons
medulla oblongata
spinal chord
30.2 Respiration and Gas Exchange
Respiratory diseases interfere with gas exchange.
• Lung diseases reduce airflow and oxygen absorption.– Emphysema destroys alveoli.– Asthma constricts airways.– Cystic fibrosis produces sticky mucus.
30.2 Respiration and Gas Exchange
• Smoking is the leading cause of lung diseases.