30.1 Respiratory and Circulatory Functions The respiratory and circulatory systems bring oxygen and...
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Transcript of 30.1 Respiratory and Circulatory Functions The respiratory and circulatory systems bring oxygen and...
30.1 Respiratory and Circulatory Functions
The respiratory and circulatory systems bring oxygen and nutrients to the cells.
30.1 Respiratory and Circulatory Functions
The respiratory system is where gas exchange occurs.
– picks up oxygen from inhaled air – expels carbon dioxide and water
nose
sinus
mouth
epiglottistrachea
lungs
30.1 Respiratory and Circulatory Functions
Breathing in driven by the diaphragm and muscles of the rib cage.
• Air flows from areas of high pressure to low pressure.
Air inhaled.
Muscles contract andrib cage expands.
Diaphragm flattensand moves downward.
Air exhaled.
Muscles andrib cage relax.
Diaphragm relaxesand rises.
30.1 Respiratory and Circulatory Functions
Path of Air
(Hair filters dust)
(Drives breathing)
(Suspended in chest cavity
bounded by ribs)Alveoli(Tiny air sacs surrounded
by capillaries)
(small tubes)(long, straight tube
in chest cavity)
(Muscular tube)
(voice box with epiglottis (flap))
30.1 Respiratory and Circulatory Functions
30.1 Respiratory and Circulatory Functions
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 diffuses from capillary into alveoli
ALVEOLI GAS EXCHANGES
capillaries
alveolus
capillary
co2
o2
Co2 diffusesinto alveolus.
O2 diffusesinto blood.
30.1 Respiratory and Circulatory Functions
Lung diseases reduce airflow and oxygen absorption.
– Asthma constricts airways. – Emphysema destroys alveoli.– Cystic fibrosis produces sticky mucus.