Download Circulatory System

Story
 In the middle of the night, a truck rolls rapidly
through the darkness. Loaded with fresh fruits and
vegetables, the truck is headed for the super market.
The driver steers off the interstate and onto a smaller
highway. Finally, after driving through narrow city
streets, the truck reaches its destination. As dawn
begins to break, store workers unload the cargo. They
work quickly because other trucks-
Story Cont.
 Carrying meats, canned goods and freshly bakes
breads- are waiting to be unloaded. And while
workers fill the store with products to be sold, a
garbage truck removes yesterday's trash. All these
trucks have traveled long distances over roads.
Without a huge network of roads, big and small, the
supermarket’s couldn’t stay in business.
Movement of Materials
roads
 Like the _______that
link all the parts of the country,
highway
your body has a “___________”
network, called the
circulatory
___________system.
heart
vessels
 This consists of the________,
blood________,
blood
and__________.
The circulatory system carries
_________substances
to _______and
carries
needed
cells
________products
away from cells.
waste
Blood
fight
 ________also
contains cells that ________disease
Needed Materials
from
 Substances that need to get _______one
part of the
body to _________are
carried by________.
another
blood
 Ex. Blood carries oxygen from your lungs to your body.
Waste Products
 The circulatory system also ________up
picks
________products
from_______.
waste
cells
 Ex. When cells use glucose (sugar), they produce carbon
dioxide as a waste product. The carbon dioxide passes
from the cells into the blood. The circulatory system
then carries the carbon dioxide to the lungs, where it is
exhaled.
Disease Fighters
 The circulatory system also __________cells
that
transports
attack ____________causing
microorganisms.
disease
sick
 This helps keep you from getting_______.
 If you do get sick, these disease fighting blood cells will
kill the microorganisms to help you get well.
Heart
muscular
pumps
 Hollow ____________organ
that ________blood





throughout the body
Made of __________muscle
cardiac
About the size of your_________
fist
center
Located in ________of
chest, behind breastbone,
inside the ribs
Each time the heart_______,
beats it pushes
_________through
blood vessels
blood
During your lifetime, your heart may beat over 3
billion
__________times,
and pump enough blood to fill over
30
_____competition
size swimming pools
Heart
Heart’s Structure
 Heart has ______sides—_______________
two
Right and Left
chambers Each side has ______compartments
or _________
two
upper and lower
 Upper chambers are called _________or
atria
Atrium
 The atrium receives blood that comes INTO the heart.
 Lower chambers are called___________
Ventricles
 Ventricles pump blood OUT of the heart
 The atria are ____________from
the ventricles
separated
by_______
valves
 Valves are flaps of tissue that prevents blood from
flowing backward
Hearts Structure
Pacemaker
 _____________:
Group of cells in right
_______atrium that
regulates the ________of
the heart.
beating
Right
receives
 ________atrium:
__________blood
from body.
Low
high
______in
oxygen, ________in
waste (carbon dioxide).
ventricle during contraction, pumps oxygen
 Right _________:
_________blood
to the_________
poor
lungs
Heart’s Structure
Atrium
 Left __________:
oxygen _______blood
moves the
rich
lungs to here during relaxation.
all
 Left ventricle: pumps oxygen rich blood to ______parts
of body.
 Septum: muscular _______that
separates heart from
wall
right to left sides.
largest
 Aorta: _________blood
vessel in the body. Carries
left
blood from ______ventricle
to the body.
Heart
STOP
How the Heart Works
 Your heart goes through two
______main phases
fills
 Relaxation (muscle): when the heart _____with
blood
 Contraction (muscle): pumps
_______blood forward

When the heart muscle relaxes, blood flows into the
chambers, the atria contract, sending blood through valves
into the ventricles. Next the ventricles contract squeezing
blood out to the body.
 This ALL happens in less than a second!
Regulation of Heartbeat
 The ___________sends
out __________that
makes the
pacemaker
signals
heart muscle contract.
constantly
 The pacemaker ____________receives
messages about
adjusts
the body’s oxygen needs and __________the
heart rate
to match.
 Ex. heart beats much faster when exercising versus
sitting due to body needing more oxygen
Blood Vessels
three
 Your body has ________kinds
of blood vessels.
oxygenated
 Arteries: carries _____________blood
away from the
heart

From the arteries, blood flows into capillaries
 Capillaries: tiny vessels (one cell thick) where
exchanged
substances are _____________between
the blood and
body cells
Oxygen, glucose one way (arteries). waste the other (veins)
From capillaries, blood flows into veins


 _________:
vessels that carry ______________blood
back
Veins
deoxygenated
to heart
Fact
 If you lightly touch the inside of your wrist, or the side
of your throat, you can feel the artery rise and fall
repeatedly---this is your pulse.
Blood
four
 Made of ________components:
red blood cells (RBC),
white blood cells (WBC), plasma, platelets.
up
lungs
 Red blood cells: picks ____oxygen
from _________and
takes to rest of body
 Produced in bone marrow
Blood
bone
 White blood cells: produced in ________marrow.
 Your bodies ________fighter
disease
 Less WBC--One WBC to every 500-1000 RBC
Blood
 Plasma: Most of the material ______________travels
transported
on plasma.
 _____________in
color
Yellowish

due to protein molecules
Blood
 Platelets: play important part in ____________blood
forming
clots.
 Ex. When you cut your finger
 Blood Video