Section 30-1
“Respiratory &
Circulatory
Systems”
Write everything that is
underlined
30.1 Respiratory and Circulatory Functions
KEY CONCEPT
The respiratory and circulatory
systems bring oxygen and nutrients to
the cells
30.1 Respiratory and Circulatory Functions
I. The respiratory and circulatory systems work together to
maintain homeostasis
• The circulatory system
transports blood and other
materials
–brings supplies to cells
–carries away wastes
–separates oxygen-poor
and oxygen-rich blood
30.1 Respiratory and Circulatory Functions
• The respiratory system is where gas
exchange occurs
–picks up oxygen from inhaled air
–expels (gets rid of) carbon dioxide
and water
sinus
nose
mouth
epiglottis
trachea
lungs
30.1 Respiratory and Circulatory Functions
The respiratory system moves gases into
and out of the blood
• The lungs contain the bronchi, bronchioles, and alveoli
• Millions of alveoli give the lungs a huge surface area
• The alveoli absorb oxygen from the air
you inhale
alveoli
bronchiole
30.1 Respiratory and Circulatory Functions
• Breathing involves the diaphragm and muscles of
the rib cage
• Air flows from areas of high
pressure to low pressure
Air inhaled.
Air exhaled.
Muscles and
rib cage relax.
Muscles contract and
rib cage expands.
Diaphragm flattens
and moves downward.
Diaphragm relaxes
and rises.
30.1 Respiratory and Circulatory Functions
II. The circulatory system moves blood to all
parts of the body
• The system includes the heart,
arteries, veins, and capillaries
– heart pumps blood
throughout body
– arteries move blood away
from heart (Artery Away)
– veins move blood back to
heart
– capillaries get blood to and
from the cells
veins
arteries
30.1 Respiratory and Circulatory Functions
• The respiratory system exchanges
oxygen and carbon dioxide with
the blood inside the body and the
outside air
• The circulatory system moves that
blood around the body and back to
the lungs
• They are working together