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THE CIRCULATORY SYSTEM
S7L2.e. Explain the purpose of
the major organ systems in the
human body(digestive,
respiration, reproduction,
THE CARDIOVASCULAR
SYSTEM
 Learning Targets
1.
2.
I can explain the purpose of the circulatory or
cardiovascular system.
I can explain how the circulatory system helps serve the
needs that cells have for oxygen, food, and waste
removal.
 Function:
The cardiovascular system carries needed substance to cells
and carries waste products away from cells. In addition, blood
contains cells that fight diseases.
VIDEO INTRODUCTIONS & SUPPORT
1st & 2nd Introduction video
 https://www.youtube.com/watch?v=AIcAF34MPpU
 6th & 7th Introduction video
 BrainPop https://www.brainpop.com/health/bodysystems/circulato
rysystem/
 Blood Pressurehttps://www.brainpop.com/health/personalhealth/bloodp
ressure/
 https://www.youtube.com/watch?v=-s5iCoCaofc
Follow up video – Bill Nye on the Heart
 https://www.youtube.com/watch?v=GbttJ-5do9M

TRANSPORTATION SYSTEM BY WHICH OXYGEN
AND NUTRIENTS REACH THE BODY'S CELLS,
AND WASTE MATERIALS ARE CARRIED AWAY.
ALSO CARRIES SUBSTANCES CALLED
HORMONES, WHICH CONTROL BODY
PROCESSES, AND ANTIBODIES TO FIGHT
INVADING GERMS.
www.biosbcc.net/doohan/ sample/htm/heart.htm
PARTS OF THE CIRCULATORY SYSTEM
Divided
into three major parts:
The Heart
2. The Blood
3. The Blood Vessels
1.
THE HEART, THE LUNGS, AND THE BLOOD
VESSELS WORK TOGETHER TO FORM THE
CIRCLE PART OF THE CIRCULATORY
SYSTEM.
CIRCULATION
 Two
parts
 Heart
acts as double
pump
 Blood
from the right
side pump is dark red
and low in oxygen
(oxygen-poor)
CIRCULATION



Travels through pulmonary
arteries to lungs where it gets
fresh oxygen and becomes
bright red
Blood from lungs through
pulmonary veins back to the
heart's left side pump
Pumped out into the body
3 KINDS OF CIRCULATION:
Pulmonary
Coronary
Systemic
circulation
circulation
circulation
PULMONARY CIRCULATION
Movement of blood from the heart,
to the lungs, and back to the heart
again
CORONARY CIRCULATION
Movement of blood through the tissues
of the heart
SYSTEMIC
CIRCULATION
Supplies nourishment
to all of the tissue
located throughout
the body,
except for the heart and lungs
BLOOD VESSELS
Hollow tubes that circulate
your blood
THREE KINDS
OF BLOOD VESSELS
Arteries
Veins
Capillaries
ARTERIES

Carry blood AWAY from the heart

Heart pumps blood

Main artery called the aorta

Aorta divides and branches

Many smaller arteries

Each region of your body has system of
arteries supplying it with fresh, oxygen-rich
blood.
ARTERIES
 Tough
on the outside
 Smooth on the inside
 Muscular wall helps the heart pump
blood (What kind of muscle is this?)
Have strong, muscular walls
The inner layer is very smooth so that the
blood can flow easily
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
CAPILLARIES
 Very
thin
 Only one cell thick
 Connect arteries & veins
CAPILLARIES
Food and oxygen released to the body cells
 Carbon dioxide and other waste products
returned to the bloodstream

w3.uokhsc.edu
Remember Cellular Processes? What is this movement across a
selectively permeable membrane called?
Valves are located inside the veins. The
valves only allow blood to move in one
direction. These venous valves keep blood
from moving backwards.
VEINS
 Carry
blood to the heart
 Receive
blood from the capillaries
 Transport
waste-rich/ oxygen-poor
blood back to the lungs and heart
 Valves
 Allow
 Veins
are located inside the veins
blood to move in one direction
have smooth muscle to help
move blood back up to the heart.
THE HEART

Size of your fist

Thick muscular walls

Divided into two pumps

Each pump has two chambers


Upper chamber - atrium receives blood
coming in from the veins
Lower chamber - ventricle squeezes blood
out into the arteries
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Close up of heart valves
Heart sounds are made by the valves
as they open and close
BLOOD




Pumped by your heart.
Travels through thousands of miles of blood
vessels
Carries nutrients, water, oxygen and waste
products to and from your body cells.
Made up of liquids, solids and small
amounts of oxygen and carbon dioxide.
BLOOD



Red blood cells carry oxygen from the lungs to all
the cells of the body.
Takes carbon dioxide and transports it back to
the lungs
About 5,000,000 Red Blood Cells in ONE drop of
blood.
BLOOD


White blood cells protect the body from
germs comes from the Lymphatic System.
Attack and destroy germs when they enter
the body
www.merck.com/pubs/mmanual_home/
illus/167i2.htm
BLOOD
 Platelets
are blood cells that help
stop bleeding
What are platelets and what do they do?
BLOOD

Plasma is the liquid part of the blood

About half of your blood is made of plasma


The plasma carries the blood cells throughout the
body
Plasma is made in the liver.
What is Blood Pressure?
• Blood pressure is a measure of the force
exerted by the blood on the wall of the
arteries.
• An example is 120/80 (systolic
pressure/diastolic pressure.
• Systolic pressure is the result of the
contraction of the ventricles (normal
110-140)
• Diastolic pressure is during the
ventricle relaxation (normal 70-90)