anatomy of the cardiovascular system
DESCRIPTION
Anatomy of the Cardiovascular System. Cardiovascular System. As Also circulatory system Consists of: the heart, arteries, veins, capillaries. Heart. Four chamber muscular organ Comparable to the size of a closed fist Located in the mediastinum Behind sternum Between 2 nd and 6 th ribs - PowerPoint PPT PresentationTRANSCRIPT
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Anatomy of the Cardiovascular
System
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Cardiovascular System• As Also circulatory system• Consists of: the heart, arteries, veins,
capillaries
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Heart• Four chamber muscular organ• Comparable to the size of a closed
fist• Located in the mediastinum
– Behind sternum– Between 2nd and 6th ribs– Between T5-T8
• Apex – base of heart – Located at the 5th intercostal space
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Heart
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Coverings of the Heart• Pericardium – loose fitting sac
surrounding the heart– Fibrous pericardium – tough, loose-
fitting, inelastic– Serous pericardium
• Parietal layer: lines the inside of the fibrous pericardium
• Visceral layer: adheres to outside of the heart
– Pericardial space: between parietal and visceral layer• Filled with 10-15mL of pericardial fluid• Decreases friction
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Walls of the Heart• Epicardium – outer layer
– Epicardium = serous pericardium• Myocardium – thick, contractile layer
composed of cardiac muscle cells– Intercalated disks contain many gap junctions– Allow cardiac muscle cells to function as a single
unit syncytium• Endocaridium – interior of cardiac wall
– Endothelial tissue– Covers projections of myocardial tissue called
trabeculae
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Walls of the Heart
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Chambers of the Heart• Atria – two superior chambers
– “Receiving chambers”– Blood from veins enters atria
• Ventricles – two inferior chambers– “pumping chambers”– Thick muscular walls to increase force of
pumping action• Left > right
– Separated by interventricular septum
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Valves of the Heart• Permit blood flow in one direction
during circulation• Atrioventricular valves (AV valves)
– Also cuspid valves– Between atria and ventricles
• Semilunar (SL valves)– Between R ventricle and pulmonary
arteries and L ventricle and aorta
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Atrioventricular Valves• Tricuspid valve
– Btwn R atrium and ventricle– 3 flaps of endocardium– Connected to ventricular papillary
muscle via chordae tendinae• Bicuspid valve
– Btwn L atrium and ventricle– Also called mitral valve– Two flaps of endocardium
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Semilunar Valves• Pulmonary semilunar valve
– Btwn R ventricle and pulmonary trunk• Aorta semilunar valve
– Btwn L ventricle and aorta
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Chambers & Valves
Trace the blood flow through the heart
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Blood Supply to the Heart• Right and left coronary arteries
– First branches off aorta – Right coronary artery right marginal
artery & posterior interventricular artery– Left coronary artery circumflex artery
& anterior interventricular artery– Most of the blood goes to the L ventricle– In 50% of the population, the R coronary
artery is dominant
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Blood Supply to the Heart• Anastomosis: Connections between blood
vessels that allow for collateral circulation• Few exist between large branches of
coronary arteries• In presence of an obstruction in a large
artery ischemia will result to a large area of tissue– Myocardial infarction (MI) (aka heart attack)
• Anastomoses do exists between smaller branches of the R and L coronary arteries
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Blood Supply to the Heart• After traveling through the capillaries
of the heart, blood empties into the R atrium via the coronary sinus
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Conduction System of the Heart
• Four structures composed of modified cardiac muscle
• Sinoatrial Node (SA Node)– Pacemaker of the heart– 100s of cells in the R atrium near the
opening of the superior vena cava• Atrioventricular Node (AV Node)
– Small mass of cardiac muscle tissue– Left lower border of R atrium
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Conduction System of the Heart
• Atrioventricular Bundle– Also Bundle of His– Bundle of specialized cardiac muscle
fibers originating in the AV node– Branches into R and L branches
eventually becoming Purkinje fibers– Extend into the walls of the ventricles
and papillary muscles
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Warming Up I 1. The apex of the heart rests on the:2. True/False: The epicardium and the
fibrous pericardium are the same structure.
3. What is the correct order of the layers of the heart from outside to inside?
4. The ____________ connect the cuspid valves to the papillary muscles.
5. What is an anastomosis?6. What is also known as the pacemaker of
the heart?
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Types of Blood Velssse• Artery – carries oxygenated blood
away from the heart– “distributors”– Arteriole: small artery– Precapillary sphincters: regulate the
blood flow into capillaries
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Types of Blood Vessels• Vein – carries unoxygenated blood
towards the heart– Great ability to stretch (capacitance)– Function as reservoirs: blood pools in
the valves then is pushed forward from the pumping pressure
– Venules: small vein
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Types of Blood Vessels
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Types of Blood Vessels• Capillaries – arterial system switches
to venous system– “primary exchange vessels”– Transport materials to and from the cells– Speed of blood flow decreases to
increase contact time– Microcirculation: blood flow between
arterioles, capillaries and venules
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Types of Blood Vessels
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Structure of Blood Vessels• Tunica adventitia - outermost layer
– Fibrous connective tissue– Holds vessels open; prevents tearing of
vessels walls during body movements– Larger in veins than arteries
• Tunica media – middle layer– Smooth muscle and elastic CT– Helps vessels constrict and dilate– Larger in arteries
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Structure of Blood Vessels• Tunica intima – innermost layer
– Composed of endothelium– Semilunar valves present in veins– One cell thick in capillaries
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Circulatory Routes • Systemic Circulation – blood flow
from the L ventricle to the body & back to the R atrium
• Pulmonary Circulation – blood flow from the R ventricle to the lungs and back to the L atrium
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Circulatory Routes
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Aorta
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Systemic Arteries• Arch of aorta• Subclavian (L and R)• Brachiocephalic• common carotid (L and R)• Axillary (L and R)• Brachial (L and R)• Radial• Ulnar
• Abdominal aorta• Common iliac• External iliac• Femoral• Popliteal• Posterior tibial• Anterior tibial• Dorsal pedis
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Systemic Veins• Superior vena cava• Inferior vena cava• External jugular• Internal jugular• Brachiocephalic (L and R)• Subclavian (L and R)• Cephalic• axillary
• Basilic• Median basilic• Median cubital• Common iliac• External iliac• Femoral• Popliteal• Great saphenous• Small saphenous
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Fetal Circulation• Two umbilical arteries carry blood to the
placenta• The placenta allows for exchange of
oxygen and nutrients from the mother. Maternal and fetal blood do NOT mix.
• Umbilical vein returns oxygenated blood and enters fetus via the umbilicus
• Foramen ovale – hole btwn the R and L atria– Allows for blood to bypass the R ventricle and
pulmonary circulation
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Fetal Circulation• Ductus arteriosus – small vessel
connecting the pulmonary artery and the aorta– Allows for another bypass route from the
lungs
**Most of fetal blood is a mixture of oxygenated and deoxygenated
blood**
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Fetal Circulation
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Changes After Birth• Umbilical vein become round
ligament• Umbilical arteries become umbilical
ligaments• Foramen ovale closes after first few
breaths– Full closure may take up to 9 months
• Ductus arteriosus contracts as soon as respirations begin– Become fibrous cord
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Changes After Birth
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Warm Up II1. What is the function of the precapillary
sphincters?2. List the layers of arteries and veins from
superficial to deep. How do the layers differ in arteries vs veins?
3. What type of tissue are capillaries composed of?
4. What blood vessel has valves?5. Differentiate between pulmonary and
systemic circulation.
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Warm Up IIIAnnouncements:• Warm ups due today• Chapter 18 quiz next Tuesday – will finish notes on
Monday• Heart and Blood Vessel Practical next WednesdayWarm Up:1. Name the arteries that branch off the aorta.2. What are the 4 divisions of the aorta?3. True/False: During fetal circulation fetal and
maternal blood mix.4. Explain the function of the umbilical cord during
fetal circulation.5. Describe the foramen ovale and the ductus
arteriosus.
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Warm Up IVAnnouncements:1. Chapter 18 Quiz tomorrow2. Practical Wednesday (sheep heart and blood
vessels)Warm Up:3. Respectively, the right and left atrioventricular
(AV) valves are also referred to as:4. From the L ventricle, blood flows into the:5. The pulmonary veins carry blood to the:6. The most abundant blood supply goes to the:7. What type of blood vessel has valves? What
type of valves are they?
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Pericardium Disorders• Pericarditis – inflammation of the heart
– Causes: trauma, viral or bacteria infection, tumor– Edema causes visceral and parietal layers to rub
together = chest pain– Pus or blood build up in pericardial space– S/S
• Pain with respirations or coughing, dyspnea, restlessness – Complications: Pericardial Effusion, Cardiac
Tamponade– Treatment:
• Antibiotics, pain meds, antiinflammatory meds, pericardiocentesis (Cardiac Tamponade)
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Cardiac Tamponade
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Heart Valve Disorders• General Principles:
– Congenital defect: decreased pumping efficiency
– Incompetent valve leak: allows backflow into previous chamber
– Stenosed valves: narrowed valve; slowing blood from out of chamber
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Heart Valve Disorders• Mitral Valve Prolapse (MVP)
– Flaps of mitral valve extend back into L atrium causes leaking
– Mostly genetic basis– 1 in 20 people– S/S: most asymptomatic; chest pain,
fatigue– Treatment: valvuloplasty
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Mitral Valve Prolapse
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Heart Valve Disorders• Aortic Regurgitation
– Blood leaks back into L ventricle during ejection into the aorta
– Volume overload in L ventricle, hypertrophy, dilation of L ventricle
– Complications: myocaridal ischemia– Treatment: valvuloplasty
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Myocardium Disorders• Atherosclerosis
– Type of arteriosclerosis– Lipids build up on the inside of vessel
walls calcify vessels hard & brittle– Risk factors: cigarette smoking, high
fat/cholesterol diet, hypertension
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Atherosclerosis
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Myocardium Disorders• Myocardial Infarction
– “Heart Attack”– Coronary thrombosis: clot– Coronary embolism: mobilized clot– Occlude coronary artery heart tissue
deprived of oxygen cell death– S/S:
• Angina pectoris – severe chest pain resulting from inadequate oxygen to myocardium
– Treatment: Coronary Bypass Surgery• Veins are harvested from other areas of the
body and used to bypass obstructions
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Myocardium Disorders• Congestive Heart Failure (CHF)
– “Left-sided Heart Failure”– Inability of the L ventricle to pump blood
efficiently– Causes: myocardial infarction– S/S: decreased pumping pressure in
systemic circulation; retained fluids• Can lead to congestion in pulmonary
circulation pulmonary edema right-sided heart failure
– Treatment: heart transplant
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Congestive Heart Failure
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Myocardium Disorders• Coronary Artery Disease (CAD)
– Leading cause of death in US– General term to describe decreased
blood flow to myocardium & associated side effects
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Disorders of the Arteries• Arteriosclerosis
– Arteries become occluded, weak and hardened
– Complications: ischemia, necrosis, gangrene
– Risk factors: age, diabetes, high fat/cholesterol diet, hypertension, smoking
– Treatment: vasodilators, angioplasty, stent placement, bypass surgery
– Complications: aneurysm
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Angioplasty
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Warm Up VIAnnouncements:1. Practical grades online2. Practical & Quiz make ups today after school3. Use next blank box on warm up sheetWarm Up:4. What two vessels return blood to the heart after
systemic circulation?5. A ___________ is a small artery.6. What procedure can open a blocked artery and
restore blood to the heart? If this doesn’t work, what is a more invasive procedure?
7. What does MONA stand for? When is this treatment used?
8. A cardiac tamponade is the result of too much fluid in the:
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Disorders of Veins• Varicose Veins
– Enlarged veins caused by pooling– Results in varicosities or varices (“spider
veins”)– Risk factors: standing for long periods
• Semilunar valves widen more pooling– Treatment: compression stockings,
surgical removal
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Varicose Veins
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Disorders of Veins• Phlebitis – vein inflammation
– Causes: irritation by IV catheter• Thrombophlebitis
– Deep vein thrombosis (DVT)– Phlebitis caused by a clot– S/S
• Pain, redness, swelling– Complications
• Pulmonary embolism
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DVT
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Pulmonary Embolism
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Venous Stasis Ulcers • Result of
chronic vein insufficiency
• Lack of oxygen to peripheral tissues
• Elevate leg & apply pressure
• Irregular edges• “Aching” pain
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Heart Defect Project• Description of the anatomical defect(s)• Etiology (causes/origin)• Resulting circulatory problem(s)
– Normal vs abnormal circulation– Perfusion– Oxygenation– Fluid balance
• Associated signs/symptoms• Prevalence (Statistics)• Treatment
– Medications– Surgery– Life Expectancy (with or without treatment)
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Patent Ductus Arteriosus (PDA)
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Atrial Septal Defect (ASD)
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Ventricular Septal Defect (VSD)
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Atrioventricular Septal Defect (AVSD)
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Tetralogy of Fallot (TOF)
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Transposition of the Great Vessels (TGV)
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Coarcatation of the Aorta (CoA)
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Ebstein’s Anomaly
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Pulmonary Atresia
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Truncus Arteriosus
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Hypoplastic Left Heart Syndrome