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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 valveHeart 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**
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Have strong, muscular walls
The inner layer is very smooth so that the blood can flow easily
http://sln.fi.edu/biosci/systems/circulation.html
VeinsVeins • 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
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Valves are located inside the veins. The valves only allow blood to move in one direction.
• Connect arteries to veins and is where oxygen & waste exchange occur.
• They are only big enough for one blood cell to pass at a time.
Capillaries
The Capillaries are in between the artery on the left and the vein on the right
The little donut-shaped red blood cell (scientific name erythrocyte) squeezes through the capillary and drops off its cargo of nutrients and oxygen
Click here for a video of blood flowingin the blood vessels
http://sln.fi.edu/biosci/systems/circulation.html
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