Download - CIRCULATORY SYSTEM System of vessels and/or spaces through which blood and/or lymph flows in a human
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CIRCULATORY SYSTEM
System of vessels and/or spaces through
which blood and/or lymph
flows in a human.
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Circulatory system
Has three (3) main parts:
A. the heart
B. blood vessels
C. blood
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A. The Heart 1. Main pump of the circulatory
system
2. MOVES Blood THROUGH the
BODY
3. Surrounded by a loose-fitting
sac called the pericardium.
4. Has four chambers: RIGHT &
LEFT ATRIA, RIGHT & LEFT
VENTRICLE
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Pulmonary artery
Left atriumLeft Ventricle - pumps O2 rich blood to the body.Right ventricle:
pumps blood from the heart to the lungs
Pulmonary artery
AORTA
Right atrium(contains thepacemaker - sends electricimpulses thatcauses heartmuscles to contract)
The Heart
Pulmonary vein
Septum-thick muscle that separates right half of heart from left half.
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VALVES: Flaps of connective tissue between the atria and ventricles that keep blood moving through the heart in one direction.
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Blood Flow in the Heart
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2 Pathways of Circulationblood FLOW
between the heart & lungs
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Carries blood between the heart & the rest of the
body
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B. BLOOD VESSELS -1. Arteries - vessels that carry
blood AWAY from the heart.
2. Capillaries - thin-walled blood
vessels in which most of the
exchange of gas, nutrients &
wastes takes place.
3. Veins - vessels that RETURN blood to the heart. Have
valves
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B. VesselsArtery VeinCapillary
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Blood Pressure
measure of the force
that blood exerts
against a vessel wall
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C. BLOOD:- A liquid tissue consisting of plasma and blood cells in a suspension.
- Transports nutrients, dissolved gases, enzymes, hormones & waste products
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Blood Cells
Red blood cells (erythrocytes)
MOST NUMEROUS, DISK-SHAPED,
CARRIES O2 TO ALL CELLS IN THE
BODY, HEMOGLOBIN
White blood cells (leukocytes)
LARGER IN SHAPE THAN RBC BUT
FEWER IN NUMBER, HELP FIGHTS
DISEASE
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plasma
platelets
YELLOWISH LIQUID PART OF BLOOD - 90% WATER & 10% PLASMA PROTEIN, DISSOLVED FAT, SALT AND SUGAR
(AID IN CLOTTING)
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Four Blood Types
Type A
Type B
Type AB (Universal Receiver)
Type O (Universal Donor)
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Blood Type or Donor
Blood Type Recipient
A
B
AB
O
Unsuccessful Transfusion Successful Transfusion
A B AB O
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LYMPH LYMPH VESSELSVESSELS
Lymph nodes Lymph
Vessels
Spleen
Thymus
Superior Vena Cava
Heart
A network of vessels that collect fluids lost by blood & returns it to the circulatory system. It produces special white blood cells.
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DisordersHYPERTENSION
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ATHEROSCLEROSIS- NARROWED ARTERIES DUE TO PLAQUE (FATTY DEPOSITS), CAN CAUSE HEART ATTACK OR STROKE.
HYPERTENSION- (“high blood pressure”)
occurs when the force of blood pumping through vessels is too great.
Anemia - when the blood transports too little oxygen.
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SICKLE-CELL DISEASE Red Blood Cells are misshapened causing blood cells to “CLOG” vessels. Hereditary
Leukemia - a form of cancer where bone marrow produces immature stem cells in large numbers & releasing them into the bloodstream.
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TAKING CARE OF THE HEART