© 2006 plano isd, plano, tx blood vessels. © 2006 plano isd, plano, tx the largest artery in the...
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© 2006 Plano ISD, Plano, TX Blood Vessels
© 2006 Plano ISD, Plano, TX
The largest artery in the body, the aorta, is almost the diameter ofThe largest artery in the body, the aorta, is almost the diameter of
a. a drinking strawa. a drinking straw
b. a computer cable
c. your big toec. your big toe
d. a garden hose
© 2006 Plano ISD, Plano, TX
If all your blood vessels were laid end-to-end, they would extend for about
If all your blood vessels were laid end-to-end, they would extend for abouta. 60,000 milesa. 60,000 miles
b. 6,000 miles
c. 60 milesc. 60 miles
d. between 1-6 miles
© 2006 Plano ISD, Plano, TX
Components of the Circulatory SystemComponents of the Circulatory System
bloodblood connective tissue made of plasma and cells
heartheart muscular pump to move blood
blood vesselsblood vessels
veins, arteries, capillaries that deliver blood to all parts of body
© 2006 Plano ISD, Plano, TX
Blood VesselsBlood Vessels
arteriesarteries veinsveinscarry oxygen-
rich blood from heart to
body
carry blood from organs
and tissues to heart
capillaries
capillariesmicroscopic blood vessels located
between arterioles and venules
© 2006 Plano ISD, Plano, TX
© 2006 Plano ISD, Plano, TX
carry blood AWAY from the heart
smallest arteries are called arterioles
have thick, strong elastic walls
ArteriesArteries
© 2006 Plano ISD, Plano, TX
Arteries carry oxygen-rich blood throughout the body.
© 2006 Plano ISD, Plano, TX
have thin, elastic walls with valves valves help veins return blood to the heart
carry blood TO the heart
VeinsVeins
smallest veins are venules
© 2006 Plano ISD, Plano, TX
Veins carry oxygen-poor blood back to the heart.
© 2006 Plano ISD, Plano, TX
connect arteries and veins
walls of capillaries are one cell layer thick
surround every cell in the body
CapillariesCapillaries
site of gas exchange
© 2006 Plano ISD, Plano, TX
Gas ExchangeGas Exchange
© 2006 Plano ISD, Plano, TX
tissue alveoli
O2
O2
O2
O2
O2
O 2
O2
O2
CO2
CO 2
CO 2
capillary
CO2
O2
Gas exchange
occurs between the thin
walls of the alveoli and
the thin walls of the capillaries.
CO2
CO 2
CO2CO2CO
2CO2CO
2
CO2
CO2
O2O2O
2
O2
O2O2O2
O2
O2
O2
© 2006 Plano ISD, Plano, TX
Most are capillaries!
Every pound of the human body has more than a mile of blood vessels!
© 2006 Plano ISD, Plano, TX
all work together to bring oxygen to and remove carbon dioxide from the cells.
Blood vessels, Blood vessels,
heart,heart, lungslungs
© 2006 Plano ISD, Plano, TX
© 2006 Plano ISD, Plano, TX
Identify.Identify.
1.
2.
3.
4.
5.1. vein
2. venule
4. artery
5. arteriole
3. capillaries
© 2006 Plano ISD, Plano, TX
Identify.Identify.
1.
2.
3.
4.
5.
© 2006 Plano ISD, Plano, TX
© 2006 Plano ISD, Plano, TX
How does the structure of capillaries help them function efficiently in CO2/O2 exchange?