Transcript 30.1 Respiratory and Circulatory Functions Lung diseases reduce

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
sinus
nose
mouth
epiglottis
trachea
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 exhaled.
Air inhaled.
Muscles contract and
rib cage expands.
Muscles and
rib cage relax.
Diaphragm flattens
and moves downward.
Diaphragm relaxes
and rises.
30.1 Respiratory and Circulatory Functions
Path of Air
(Hair filters dust)
(Muscular tube)
(voice box with
epiglottis (flap))
(long, straight tube
in chest cavity)
(small tubes)
(Tiny air sacs
surrounded
by capillaries)
(Suspended in
chest cavity
bounded by ribs)
Alveoli
(Drives breathing)
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
GAS EXCHANGES
ALVEOLI
capillary
alveolus
Co2 diffuses
into alveolus.
co2
o2
capillaries
O2 diffuses
into 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.