The Circulatory System Ms. Martinez Biology
http://www.youtube.com/watch?v=SGjHjdEY0vA
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The Circulatory System The circulatory system transports :
Nutrients Metabolites Excretory/Waste Products Gases Hormones Cells
Heat To and from different places in the body
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The Closed Circulatory System
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lungs head & arms liver digestive system kidneys legs
pulmonary artery aorta pulmonary vein main vein LeftRight How does
this system work? Circulatory System
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Three Major Elements Heart Blood Vessels Blood
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The Heart The heart pumps blood into large vessels that branch
into smaller ones leading into the organs.
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The Heart Has 4 Chambers Right atrium Right ventricle Left
atrium Left ventricle
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what s in red blood cells white blood cells platelets plasma
carbon dioxide digested food waste (urea) hormones oxygen
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Flow and Resistance Blood flow occurs due to hydraulic pressure
differences. The high pressures are created by the pumping of the
heart (specifically ventricular contraction) Flow resistance Blood
velocity is dependent on cross sectional area, not pressure Any
change in the radius of the small arteries or arterioles has a
large effect on the resistance and therefore the pressure necessary
to pump blood
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More cellsconstriction of blood vessel walls
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Cardiac Cycle Heart is two pumps that work together, right and
left half Repetitive contraction (systole) and relaxation
(diastole) of heart chambers Blood moves through circulatory system
from areas of higher to lower pressure. Contraction of heart
produces the pressure
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Blood Pressure Blood against the blood vessels walls The
SYSTOLIC pressure refers to The pressure recorded while the
ventricles pump the blood The DIASTOLIC pressure refers to The
pressure recorded as the ventricles fill with blood
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Hypertension High blood pressure Heart works harder than
necessary Increases risk of heart attack orstroke
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Viscosity Having relatively high resistance to flow Example:
Think about pouring these itemshow do they flow? Syrup Oil Yogurt
milkshake
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Artheroclerosis Fatty Deposits called plaque Builds up in walls
of arteries Obstructs flow Also a risk is clot breaks free and
blocks flow elsewhere
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SUMMARY Complete the following; Arteries take blood ______ from
the heart. The walls of an artery are made up of thick _________
walls and elastic fibres. Veins carry blood ________ the heart and
also have valves. The _________ link arteries and veins, and have a
one cell thick wall. Blood is made up of four main things ______,
the liquid part of the blood; Red Blood Cells to carry ______;
White Blood cells to protect the body from disease and _________ to
help blood clot.
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SUMMARY Complete the following; Arteries take blood ______ from
the heart. The walls of an artery are made up of thick _________
walls and elastic fibres. Veins carry blood ________ the heart and
also have valves. The _________ link arteries and veins, and have a
one cell thick wall. Blood is made up of four main things ______,
the liquid part of the blood; Red Blood Cells to carry ______;
White Blood cells to protect the body from disease and _________ to
help blood clot. away platelets towards capillaries plasma oxygen
muscular