circulatory system

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Circulatory System

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Circulatory System. Consists of. Heart Blood Vessels Blood. Function. Transports oxygen and nutrients to the cells Transports carbon dioxide and metabolic waste away from the cells. Heart. Define Muscular, hollow organ Size of a clenched fist - PowerPoint PPT Presentation

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Page 1: Circulatory System

Circulatory System

Page 2: Circulatory System

Consists of

• Heart

• Blood Vessels

• Blood

Page 3: Circulatory System

Function

• Transports oxygen and nutrients to the cells

• Transports carbon dioxide and metabolic waste away from the cells

Page 4: Circulatory System

Heart

• Define– Muscular, hollow

organ– Size of a clenched fist– Located in the center

of the chest, under the sternum, tipped slightly to the left

– Apex is the bottom of the heart

Page 5: Circulatory System

Layers of the Heart

• Endocardium– Epithelial tissue– Lines heart

• Myocardium– Middle layer– Cardiac muscle tissue

• Pericardium– Epithelial tissue– Covers outside of heart

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Septum

Wall that divides the heart into left and right

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Heart Chambers

• Atria (atrium)1. Right 3. Left

• Ventricle2. Right4. Left

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Heart Valves

• Tricuspid– Separates the right

atrium from the right ventricle

– Has 3 flaps• Mitral

– Separates the left atria and the left ventricle

– Has 2 flaps

Page 10: Circulatory System

• Pulmonary valve– Separates the right

ventricle from the pulmonary artery

• Aortic valve– Separates the left

ventricle from the aorta

Page 11: Circulatory System

Cardiac Cycle• Right and left atriums

contract and work together

• Right and left ventricles contract and work together

• Systole – period of ventricular contraction

• Diastole – brief period of rest

Page 12: Circulatory System

Blood Pressure 120/70

• Diastolic– Bottom number– Heart relaxes as it

passively fills with blood

• Systolic– Top number– Highest pressure in

vessels when the ventricles contract

Page 13: Circulatory System

Pattern of Circulation • Superior and inferior vena cava• Right atrium• Tricuspid valve• Right ventricle• Pulmonary valve• Pulmonary artery• Lungs• Pulmonary veins• Left atrium• Mitral valve• Left ventricle• Aortic valve• Aorta• Arteries• Arteriole• Capillaries• Venules• Veins• Superior and inferior vena cava

Page 14: Circulatory System

Electrical Conductive Pathway

• Function– Electrical impulses in the heart cause the contraction

of the muscles– A group of nerve cells that send out an electrical

impulse which spreads out over the heart– SA Node

• Sinoatrial node• Located in the right atrium

– AV Node• Atrioventricular node• Located in the septum between the atriums and the

ventricles

Page 15: Circulatory System

• Bundle of HIS– Nerve cells in the

septum• Right and Left Bundle

Branches– Divides off Bundle of

HIS• Purkinje Fibers

– A network of nerve fibers throughout the ventricles

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EKG - Electrocardiogram

• Record of the movement of the electrical impulse as it travels through the heart

Page 18: Circulatory System

Normal EKG

Page 19: Circulatory System

Arrhythmias

• Abnormal or irregular heart rhythms

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Defibrillators

• When the heart is in atrial or ventricular fibrillation, the heart must be shocked with an electrical current to stop the uncoordinated contraction and allow the SA node to regain control

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Pacemakers

• A small battery powered device with electrodes that monitors the hearts activity and delivers an electrical impulse to stimulate contraction

• Fixed and demand• Avoid electromagnetic forces like

microwaves and cellular phones

Page 23: Circulatory System

Pacemakers

Page 24: Circulatory System

Blood Vessels• Arteries

– Carry blood away from the heart

– Largest is the aorta– Smaller arteries called

arterioles– After the blood leaves

the left ventricle the first branch off the aorta is the coronary arteries

– Walls are more muscular and elastic

Page 25: Circulatory System

VeinsCarry blood back to the

heartLargest veins – superior

and inferior vena cavaVeins are thinner and

have less muscle tissue

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Valves

Veins contain valves to prevent the backward flow of blood

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CapillariesOne cell thick walls

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Where the exchange of oxygen and carbon dioxide takes place

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Capillary Bed

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Blood

• Called a tissue because it contains many types of cells

• 4-6 quarts in the average adult• Composed of plasma and formed

elements called blood cells• Plasma is 90% water with dissolved

elements in it

Page 32: Circulatory System

Functions

• Carries oxygen from the lungs to the cells and carbon dioxide from the cells to the lungs

• Nutrients from the digestive tract to cells• Metabolic waste from the cells to organs of

excretion• Carries heat produced by the body• Carries hormones to body organs

Page 33: Circulatory System

Blood Types

• O, A, B, AB• Rh factor positive or negative

Universal DonorO+

Universal RecipientAB+

Page 34: Circulatory System

Blood Types• Out of 100 people, about:

       • 38 will be O +        • 7 will be O -        • 34 will be A +        • 6 will be A -        • 8 will be B +        • 2 will be B -        • 4 will be AB +        • 1 will be AB -

• Who Can Receive Whose Red Blood Cells:       • O - can only use O -        • O + can use O + or O -        • A - can use A - or O -        • A + can use A +, A -, O + or O -        • B - can use B - or O -        • B + can use B +, B -, O + or O -        • AB - can use AB -, A -, B - or O -       • AB + can use All Blood Types

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Agglutination

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Blood Cells• Erythrocytes

- Red Blood Cells RBC– Function to carry oxygen

and carbon dioxide– Live for 120 days– Shaped like a doughnut– Contains hemoglobin – a

blood protein– Amount of hemoglobin

gives blood its red color – Carries the O2 and CO2

Page 39: Circulatory System

Leukocytes

• White blood cells - WBC• Function – fight infection• Live 3-9 days• Fight infection by

phagocytes• 5 types of leukocytes

Page 40: Circulatory System

Phagocytosis

Page 41: Circulatory System

Thrombocytes• Thrombocytes

– Platelets– Cell fragments– Formed in the bone

marrow• Function

– Clotting– Thrombus is a stationary

clot– Embolus is a moving clot

• Live– 5 to 9 days

Page 42: Circulatory System

Diseases

• Anemia– Too little RBS’s or

hemoglobin or both– Many types

Sickle Cell AnemiaAplastic anemiaPernicious anemiaIron deficiency anemia

Page 43: Circulatory System

Sickle Cell Anemia• Chronic inherited

anemia• Occurs almost

exclusively in African Americans

• Cells are abnormally shaped like a sickle

• Crisis occur when they block the vessels and severe pain results

Page 44: Circulatory System

Aneurysm

• A ballooning out or weakness of an artery wall

• Usually asymptomatic• May rupture and

hemorrhage and death results

• Repair is possible if diagnosed early

Page 45: Circulatory System

Common Aneurysm SitesCerebral, Aortic, Abdominal

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Repair of an Aneurysm

Page 47: Circulatory System

Arteriosclerosis

• Hardening of the arteries

• Results in the loss of elasticity and contractility

• Results of aging• Causes hypertension

Page 48: Circulatory System

Atherosclerosis

• Deposits of plaque on artery wall

• If plaque breaks loose circulates as an emboli and

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Surgical Repair

• CABG– Coronary artery

bypass graft– A vein from the leg or

chest is used to go around or “bypass” the blockage

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Stent

• Insertion of an expandable coil that

• Keeps the vessel open

• Some are medicated

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Hemophilia

• Inherited disease that occurs mostly in males but carried by females

• Lack of a clotting factor (VII most common)

• Minor cut can cause prolonged bleeding

Page 52: Circulatory System

Hypertension• Increased blood

pressure• Caused by a

narrowing of the vessels or too much fluid in the vessel

• Controlled with medication and diet very effective

• Leading cause of stroke

Page 53: Circulatory System

Hypotension

• Low blood pressure• Due to dilation of the

blood vessels, shock, or hemorrhage

Page 54: Circulatory System

Leukemia

• Cancer of the bone marrow or lymph tissue

• Results in a high number of immature WBC”s

• Treatment– Radiation, chemo,

bone marrow transplant

Page 55: Circulatory System

Myocardial Infarction

• Heart Attack• Due to blockage in

the coronary arteries that cuts off the blood supply to the heart

• Treatment includes clot busting drugs, CABG, stents

Page 56: Circulatory System

Phlebitits

• Inflammation of a vein• If caused by a clot it is

called thrombophlebitis

Page 57: Circulatory System

Varicose Veins

• Dilated, swollen veins