Circulatory System

StoryIn 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 MaterialsLike the _______that link all the parts of the

country, your body has a “___________” network, called the ___________system.

This consists of the________, blood________, and__________. The circulatory system carries _________substances to _______and carries ________products away from cells.

________also contains cells that ________disease

roadshighwaycirculator

y heart vesselsblood

needed cells

waste

fight Blood

Needed MaterialsSubstances that need to get _______one part

of the body to _________are carried by________.Ex. Blood carries oxygen from your lungs to

your body.

from another blood

Waste ProductsThe circulatory system also ________up

________products from_______.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.

picks

waste cells

Disease FightersThe circulatory system also __________cells

that attack ____________causing microorganisms.

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.

transports diseas

e sick

HeartHollow ____________organ that ________blood

throughout the bodyMade of __________muscleAbout the size of your_________Located in ________of chest, behind

breastbone, inside the ribsEach time the heart_______, it pushes

_________through blood vesselsDuring your lifetime, your heart may beat over

3 __________times, and pump enough blood to fill over _____competition size swimming pools

muscular

pumps

cardiac fist

center

beatsblood

billion

30

Heart

Heart’s StructureHeart has ______sides—_______________Each side has ______compartments or _________

upper and lowerUpper chambers are called _________or atria

The atrium receives blood that comes INTO the heart.

Lower chambers are called___________Ventricles pump blood OUT of the heart

The atria are ____________from the ventricles by_______Valves are flaps of tissue that prevents blood from

flowing backward

two Right and Lefttwo chamber

s-

Atrium

Ventricles

separated valves

Hearts Structure_____________: Group of cells in _______atrium

that regulates the ________of the heart.________atrium: __________blood from body.

______in oxygen, ________in waste (carbon dioxide).

Right _________: during contraction, pumps oxygen _________blood to the_________

right

beating

Pacemaker

Right receives Low high ventricl

epoor lungs

Heart’s StructureLeft __________: oxygen _______blood moves

the lungs to here during relaxation.Left ventricle: pumps oxygen rich blood to

______parts of body.Septum: muscular _______that separates

heart from right to left sides.Aorta: _________blood vessel in the body.

Carries blood from ______ventricle to the body.

Atrium

rich

all

wall

largest left

Heart

STOP

How the Heart WorksYour heart goes through ______main phases

Relaxation (muscle): when the heart _____with blood

Contraction (muscle): _______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.

two

fills

pumps

This ALL happens in less than a second!

Regulation of HeartbeatThe ___________sends out __________that

makes the heart muscle contract.The pacemaker ____________receives

messages about 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

pacemaker

signals

constantly adjust

s

Blood VesselsYour body has ________kinds of blood vessels.

Arteries: carries _____________blood away from the heart From the arteries, blood flows into capillaries

Capillaries: tiny vessels (one cell thick) where 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 to heart

three oxygenate

d

exchanged

Veins deoxygenated

FactIf 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.

BloodMade of ________components: red blood cells

(RBC), white blood cells (WBC), plasma, platelets.

Red blood cells: picks ____oxygen from _________and takes to rest of bodyProduced in bone marrow

four

up lungs

BloodWhite blood cells: produced in

________marrow.Your bodies ________fighterLess WBC--One WBC to every 500-1000 RBC

bone

disease

BloodPlasma: Most of the material

______________travels on plasma._____________in color

due to protein molecules

transported

Yellowish

BloodPlatelets: play important part in

____________blood clots.Ex. When you cut your finger

forming

Blood Video