Circulatory System
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Transcript 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