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3 Major types of blood
vessels
1.Arteries
2.Capillaries
3.Veins
Arteries carry blood away from the heart
-”branch,” “diverge” or “fork”
Veins carry blood toward the heart
-”join”, “merge,” “converge”
Circulationhst
Special features of veins
• Valves
– Prevent backflow
– Most abundant in legs (where blood has
to travel against gravity)

• Muscular contraction
– Aids the return of blood to heart in
conjunction with valves
Mechanical issues…
(really good to know)
Exercise helps
circulation
(because
muscles
contract and
squeeze blood
back to the
heart)
Circulationhst
Circulationhst
Circulationhst
Circulationhst
heart attack!
Blood Flow through the Human Body

Blood with little oxygen is pumped from the Right Atrium through a valve to
the Right Ventricle and through another valve into the Pulmonary artery. The
Pulmonary artery sends it to the Lungs to pick up Oxygen. It’s sent from the
Lungs through Pulmonary vein to the Left Atrium through a valve to the Left
Ventricle. The Left Ventricle sends it through a valve to the Aorta. The Aorta
is a series of branches that sends oxygenated blood throughout the body.
• Heart Rate
can be
determined
using a
Stethoscope

376

400
300
200
100
0

200

Mammals

40

m

ou
se

70

el
ep
ha
gr
nt
ey
w
ha
le
hu
m
an

9

co
w

ca
t

el

30

lio
n

50

28

ca
m

Heartbeats per
minute

Average Heart Rate of some
Mammals
• Hold out your hand and make a fist. If you're a kid,
your heart is about the same size as your fist, and if
you're an adult, it's about the same size as two fists.
• Your heart beats about 100,000 times in one day and
about 35 million times in a year. During an average
lifetime, the human heart will beat more than 2.5
billion times.
• Give a tennis ball a good, hard squeeze. You're using
about the same amount of force your heart uses to
pump blood out to the body. Even at rest, the
muscles of the heart work hard--twice as hard as the
leg muscles of a person sprinting.
• If you had a massive cut to the arm and blood was
spurting out, is that a cut artery or cut vein?
Circulationhst
help the blood drop find his way!
•
•
.
•
•
•
•
•
•
•
•
•
•

superior vena cava
Aorta and to the body organs & cells
right atrium
tricuspid valve
Left Ventricle
left atrium
Aortic Semilunar Valve
Right Ventricle
Bicuspid Valve
Lungs for oxygen pickup
pulmunary arteries
Pulmonary Veins
Pulmonary Semilunar Valve

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Circulationhst

  • 1. 3 Major types of blood vessels 1.Arteries 2.Capillaries 3.Veins Arteries carry blood away from the heart -”branch,” “diverge” or “fork” Veins carry blood toward the heart -”join”, “merge,” “converge”
  • 3. Special features of veins • Valves – Prevent backflow – Most abundant in legs (where blood has to travel against gravity) • Muscular contraction – Aids the return of blood to heart in conjunction with valves Mechanical issues… (really good to know)
  • 10. Blood Flow through the Human Body Blood with little oxygen is pumped from the Right Atrium through a valve to the Right Ventricle and through another valve into the Pulmonary artery. The Pulmonary artery sends it to the Lungs to pick up Oxygen. It’s sent from the Lungs through Pulmonary vein to the Left Atrium through a valve to the Left Ventricle. The Left Ventricle sends it through a valve to the Aorta. The Aorta is a series of branches that sends oxygenated blood throughout the body.
  • 11. • Heart Rate can be determined using a Stethoscope 376 400 300 200 100 0 200 Mammals 40 m ou se 70 el ep ha gr nt ey w ha le hu m an 9 co w ca t el 30 lio n 50 28 ca m Heartbeats per minute Average Heart Rate of some Mammals
  • 12. • Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists. • Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times. • Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard--twice as hard as the leg muscles of a person sprinting. • If you had a massive cut to the arm and blood was spurting out, is that a cut artery or cut vein?
  • 14. help the blood drop find his way! • • . • • • • • • • • • • superior vena cava Aorta and to the body organs & cells right atrium tricuspid valve Left Ventricle left atrium Aortic Semilunar Valve Right Ventricle Bicuspid Valve Lungs for oxygen pickup pulmunary arteries Pulmonary Veins Pulmonary Semilunar Valve