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Circulatory System
By: Kaleb, William, Laurence, and Braden
What Is the Circulatory System?
A vast network of organs, vessels and arteries that transports blood, nutrients, oxygen
and hormones to individual cells and different parts of the body. The organs located in
different parts of the body lets blood flow to anywhere on the body.
Organs/Factors Involved and their Function
● Heart: pumps blood through the network of blood vessels.
● Blood vessels: the body’s highways for the flow of blood.
● Arteries: specific blood vessels that carry blood away from the heart.
● Blood: holds nutrients, oxygen, hormones, red blood cells, white blood cells,
and liquid plasma.
● Veins: transports blood back to the heart from all organs.
Interacting with Other Systems
Respiratory System
Digestive System
Blood is sent to the lungs to get rid of all the
carbon dioxide and regain oxygen
The digestive system breaks down food and
sorts out the important nutrients and vitamins
for the body
The carbon dioxide is then exhaled through
the respiratory system and goes into the
atmosphere
The circulatory system is then able to
transport the nutrient rich cells to the rest of
the body
Components of Blood and their Function
Plasma
Plasma is the main component, made up of:
Water
Sugar
Proteins
Salts
Fat
Plasma transports blood cells, along with nutrients, waste products, antibodies,
Red Blood Cells
Accounts for around 45% of the volume of blood.
Shaped like a biconcave disk with a flattened center.
Production is controlled by a hormone called erythropoietin.
Start as immature cells in bone marrow, then release into blood flow after 7 days.
No nucleus, can easily change shape.
Survive only on average 120 days.
Contains protein hemoglobin, helping carry oxygen from the lungs to the body and
bring CO2 back to the lungs to be exhaled.
White Blood Cells
Protect body from infection
Account for about 1% of blood.
Most common type is neutrophil
Most common type, makes up around 55 to 70 percent of white blood cells
Is the “immediate response” white blood cells
Lasts less than a day
Transfusion is not effective
Other major type: lymphocyte
2 major types of lymphocyte: T lymphocyte and B lymphocyte
T lymphocytes regulates function of other white blood cells and directly attacks infected areas
B lymphocytes create antibodies.
Platelets
Small fragments of cells
Helps the blood clotting process (also called coagulation)
Gathers at the site of the injury
Stick to the lining of the damaged blood cells
Forms a platform for coagulation to occur
Creates fibrin clot, covering the wound
Higher counts of platelets can lead to strokes or heart attacks
Antiplatelet therapies help prevent such events
Blood Pressure
Blood pressure is closely related to the rate of heartbeat. It is a measure of how hard
your heart is contracting compared to the resistance to stretching of the artery walls
High blood pressure can start tearing the walls of the artery, leading to the formation of
scar tissue. This happens because higher blood pressure means too much force is
being exerted onto the arteries.
Too low of blood pressure indicates that the blood vessel walls are too relaxed, and are
not effectively pushing and pumping blood around the body. This can lead to physical
fatigue and fainting, and it leaves an impact on mental health as well, causing sleep
troubles and a more melancholy attitude.
Lower blood pressure is, in many cases, more common than higher blood pressure
Chambers of the Heart
There are 4 chambers in the heart of all
mammals, including humans.
The right atrium takes in blood with low
oxygen and then pumps it to the right ventricle
so that it can be pumped to the lungs.
The left atrium receives blood rich with
oxygen and then pumps it to the left ventricle
so that it can be pumped out to the rest of the
body.
Oxygenated Blood and Deoxygenated Blood
Deoxygenated Blood
Oxygenated Blood
Vena Cava
Pulmonary Vein
Right Atrium
Left Atrium
Right Ventricle
Left Ventricle
Pulmonary Artery
Aorta
Lungs
Lungs
Blood Capillaries
Blood Capillaries
Arteries
Veins
Carries blood from tissues of body to the heart
Carries blood away from the heart and to tissues
Usually found closer beneath the skin
Deeper in the body
Less muscular
More muscular
Collapse if blood flow stops
Would remain open if blood flow stops
Diseases and disorders
Atherosclerosis- caused by fatty plaques lining the blood vessels
Coronary artery disease- the clogging of the arteries supplying the heart
Hypertension (high blood pressure)- causes the heart to work harder and can lead to
complications with the heart like, a heart attack, or a stroke.
Maintaining Homeostasis
Oxygen is carried in our blood stream to our cells so energy can be made. When we
exercise both breathing and heart beat (blood circulation) must increase to meet the
demand of our cells to take in oxygen and get rid of carbon dioxide. This is how the body
maintains homeostasis.
Sources
http://www.newhealthadvisor.com/Path-of-Blood-Through-the-Heart.html
https://www.khanacademy.org/science/health-and-medicine/circulatory-system-diseases
https://www.dmu.edu/medterms/circulatory-system/circulatory-system-diseases/
https://www.reference.com/science/circulatory-system-maintain-homeostasis-95aba756d92cb71b
http://www.livescience.com/22486-circulatory-system.html
http://www.cpalms.org/Public/PreviewResourceLesson/Preview/75826
http://anthro.palomar.edu/blood/blood_components.html
http://www.avogel.ca/en/health/circulation/low-blood-pressure.php
http://www.heart.org/HEARTORG/Conditions/HighBloodPressure/WhyBloodPressureMatters/Heart-and-Artery-Damage-and-HighBlood-Pressure_UCM_301823_Article.jsp#.V18ndzf4ziY