the circulatory system “ a transport service”. circulatory system consists of… heart blood...
TRANSCRIPT
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The Circulatory System
“ A Transport Service”
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Circulatory System Consists of…
• Heart
• Blood Vessels
• Blood
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HEART: The Vital Pump
On average, the heart contracts 72 times a minute, pumping about 5 quarts of blood.
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Structure and Function
• Keeps blood moving• Large organ
composed of – cardiac muscle, – rich in mitochondria– Enclosed by a
PERICARDIUM sac
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Structure of Heart (cont)
• Four chambers :
– Two upper (Atria)
– Two lower (Ventricles)
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Right Ventricle
Right Atrium
Left Atrium
Inferior Vena CavaVein that brings oxygen-poor blood from the lower part of the body to the right atrium
Tricuspid ValvePrevents blood from flowing back into the right atrium after it has entered the right ventricle
Pulmonary ValvePrevents blood from flowing back into the right ventricle after it has entered the pulmonary artery
Pulmonary VeinsBring oxygen-rich blood from each of the lungs to the left atrium
Superior Vena CavaLarge vein that brings oxygen-poor blood from the upper part of the body to the right atrium
AortaBrings oxygen-rich blood from the left ventricle to the rest of the body
Pulmonary ArteriesBring oxygen-poor blood to the lungs
Aortic ValvePrevents blood from flowing back into the left ventricle after it has entered the aorta
Mitral ValvePrevents blood from flowing back into the left atrium after it has entered the left ventricle
Left Ventricle
Septum
Structures of the Heart
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Blood Flow Through the Heart
©COPY 1997 HeartPoint
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Blood Flow Through the Heart
• Both Atria fill at same time
– Right atrium receives oxygen POOR blood from body through vena cava
– Left atrium receives oxygen RICH blood from lungs through four pulmonary veins
• After filled with blood atria contract, pushing blood into ventricles
STEP 1
STEP 2
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•Both ventricles contract
Right ventricle contracts and pushes oxygen-poor blood toward lungs,
-against gravity-through pulmonary arteries
STEP 3
Left ventricle contracts and forces oxygen rich blood • out of heart through aorta (largest vessel)
This creates the “lub” sound of the heartbeat.
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STEP 4
• As the ventricles relax, the valves snap shut.
• Blood start filling the atria, and the cycle begins again.
This creates the “dub” sound, finishing the heartbeat.
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Heart - as two separate pumps:
• Circulation of blood between the heart and the lungs- PULMONARY circulation
• Circulation of blood between the heart and the rest of the body- SYSTEMIC circulation
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Circulatory System
BLOOD VESSELS
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Blood Vessels: Pathway of Circulation
• 3 types of vessels– Arteries– Capillaries– Veins
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Arteries:carry blood Away from heart
– Large– Thick-walled, Muscular– Elastic– Oxygenated blood
• Exception -Pulmonary Artery
– Carried under great pressure
– Steady pulsating
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Capillary
Connective tissue
Connective tissue
Smooth muscle
Smooth muscle
Endothelium
Endothelium
Valve
Venule
Endothelium
Arteriole VeinArtery
Capillaries - Smallest vessels
– Microscopic– Walls one cell thick– Nutrients and gases diffuse here
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Veins:Carry blood to heart
– Carry blood that contains waste and CO2
• Exception -pulmonary vein
– Blood not under much pressure
– Valves to prevent much gravity pull
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Circulatory System
BLOOD
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The Blood
• Body contains 4-6 L• Consists of
– Water– Red Blood Cells– Plasma– White blood cells and
platelets
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Whole Blood Sample
Red blood cells
White blood cells
Platelets
Plasma
Sample Placed in Centrifuge Blood Sample That Has Been Centrifuged
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Parts of the Blood
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Blood: Fluid Transport
Liquid Portion Carries • Blood cells
– red blood cells– white blood cells
• Platelets (non cellular particles)• Proteins
– Enzymes – Hormones – Endocrine System
• Nutrients - Digestive System• Gases - Respiratory System• Inorganic salts
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Carbon Dioxide in the Blood
• CO2 is a waste product of cellular work
• 70% of CO2 combines with water
• The rest travels to the lungs
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RBC• Transporters of
– Oxygen– Carbon Dioxide
• RBC– Lack a nucleus– Contain hemoglobin– Disk-shaped
• RBC are produced in red bone marrow of – ribs, – humerus, – femur, – sternum, and other long bones
• Lives for 120 days• Old RBC are destroyed in liver
and spleen
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WBC
• WBC fight infection– Attack foreign
substances
• Less abundant• Large cells• Some live for
months– Most just a few days
• Several types• ALL contain nuclei
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Platelets
• PLATELETS are for CLOTTING blood
• Cell fragments
• Produced in bone marrow
• Short life span (1 week)
• Fibrin (sticky network of protein fibers)– Form a web trapping blood cells
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Blood Clotting
Break in Capillary Wall
Blood vessels injured.
Clumping of Platelets
Platelets clump at the site and release thromboplastin. Thromboplastin converts prothrombin into thrombin..
Clot Forms
Thrombin converts fibrinogen into fibrin, which causes a clot. The clot prevents further loss of blood..
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Blood Types
• Massive loss of blood requires a transfusion
• Four Types– A– B– AB– O
• Inherited from your parents
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Blood Pressure
• Blood against the blood vessel’s 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.
• A normal blood pressure is 120/80
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Disorders (cont)
• Hypertension– High blood pressure– Hearts works harder than necessary– Increases risk of heart attack or stroke
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Disorders (cont)
• Heart Attack– Atherosclerosis in coronary artery– Heart muscle begins to die
• Symptoms– Nausea– Shortness of breath– Severe chest pain
IMMEDIATE MEDICAL ATTENTION NECESSARY
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Disorders (cont)
• Stroke– Blood clot gets stuck in blood vessels leading
to brain– Brain cells die due to lack of oxygen
• Or blood vessel burst
– Can lead to paralysis, • loss of ability to speak• death
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Current PREVENTION Recommendations
• Regular exercise• Weight control• Well balanced diet• Do not smoke• Diet low in saturated
fat