The Circulatory System
The circulatory system is the
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
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 a 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
http://users.tpg.com.au/users/amcgann/body/circulatory.html
3 Types of Circulation:
• Pulmonary circulation
• Coronary circulation
• Systemic circulation
Pulmonary Circulation
Movement of blood from the heart, to the
lungs, and back to the heart again
***Remember heart
lungs and back***
sln.fi.edu/biosci/systems/ pulmonary.html
Coronary Circulation
Movement of blood through the tissues of
the heart
***The way blood moves in the heart***
http://sln.fi.edu/biosci2/systems/
Systemic Circulation
Supplies nourishment to all of the tissue
located throughout the body , except for
the heart and lungs
***Blood moving all over the body (except
the heart and lungs)***
http://sln.fi.edu/biosci/systems/systemic.html
3 Parts of the Circulatory System
• Divided into three major parts:
– The Heart
– The Blood
– The Blood Vessels
The Heart
• Size of your fist
• Four Chambers: Left Atrium, Right Atrium,
Left Ventricle, Right Ventricle
• Divided into two sides
• Each side 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 valve
Heart sounds are made by the valves
as they open and close
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Blood
• Pumped by your heart.
• 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
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Blood
• Hemoglobin- the chemical that carries
oxygen and carbon dioxide in the blood
• Plasma- the liquid part of the blood that
carries nutrients
• Platelets- the odd-shaped cell fragments
that help clot blood
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
user.gru.net/clawrence/ vccl/chpt7/plate.htm
Blood Vessels
Hollow tubes that circulate your blood
Three Kinds of Blood Vessels
• Arteries
• Veins
• Capillaries
Arteries
Arteries
• carry oxygen-rich blood
away from the heart.
• They are usually
designated by the color red
because oxygen-rich blood
is red.
• ***Remember they carry
blood away from the
heart**
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
http://sln.fi.edu/biosci/systems/circulation.html
Veins
Veins
• carry oxygen-poor blood
back to the heart from the
rest of the body.
• They are usually
designated by the color
blue because oxygen-poor
blood is a dark red color.
• ***Remember that they
carry blood to the heart***
Veins
http://sln.fi.edu/biosci/systems/circulation.html
Valves are located inside the veins. The valves
only allow blood to move in one direction.
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Capillaries
• Connect arteries to veins
and is where oxygen &
waste exchange occur.
The Capillaries are in between the artery
on the left and the vein on the right
• They are only big enough
for one blood cell to pass
at a time.
Click here for a video of blood flowing
in the blood vessels
The little donut-shaped red blood cell (scientific name
erythrocyte) squeezes through the capillary and drops
off its cargo of nutrients and oxygen
http://sln.fi.edu/biosci/systems/circulation.html
w3.uokhsc.edu
http://users.tpg.com.au/users/amcgann/body/circulatory.html
4 ways to care for the
Circulatory System
1. Eliminate excess weight
2. Exercise to strengthen heart muscle
3. Manage Stress
4. Avoid Smoking
What is Blood Pressure?
Force of blood on the walls of blood vessels
Diseases of the Circulatory
System
• Hypertension- high blood pressure
• Atherosclerosis- buildup of fats on the
walls of arteries which can cause heart
attacks
• Leukemia- cancer of the blood which
prevents the production of healthy blood
cells