Anatomy of the Cardiovascular System TENTATIVE Dates: Tuesday April 19 th – Chapter 18 Quiz...

Anatomy of the Cardiovascular

SystemTENTATIVE Dates:

Tuesday April 19th – Chapter 18 QuizWednesday April 20th – Heart Anatomy

PracticalFriday May 6th – Project Due

Block Days (May 11th or 12th) – Chapter 18/19 Test

Cardiovascular System

• 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 2nd and 6th ribs– Between T5-T8

• Apex – base of heart – Located at the 5th intercostal space

Heart

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

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

Walls of the Heart

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

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

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

Semilunar Valves

• Pulmonary semilunar valve– Btwn R ventricle and pulmonary trunk

• Aorta semilunar valve– Btwn L ventricle and aorta

Chambers & Valves

Trace the blood flow through the heart

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

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

Blood Supply to the Heart• After traveling through the capillaries

of the heart, blood empties into the R atrium via the coronary sinus

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

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

Warm Up 4/12/11

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?

Types of Blood Vessels

• Artery – carries oxygenated blood away from the heart– “distributors”– Arteriole: small artery– Precapillary sphincters: regulate the

blood flow into capillaries

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

Types of Blood Vessels

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

Types of Blood Vessels

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

Structure of Blood Vessels• Tunica intima – innermost layer

– Composed of endothelium– Semilunar valves present in veins– One cell thick in capillaries

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

Circulatory Routes

Aorta

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

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

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

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**

Fetal Circulation

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

Changes After Birth

Warm Up 4/13-14/11

1. 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.

Warm Up 4/15Announcements:• 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.

Warm Up 4/18/11

Announcements:1. Chapter 18 Quiz tomorrow2. Practical Wednesday (sheep heart and blood

vessels)Warm Up:1. Respectively, the right and left atrioventricular

(AV) valves are also referred to as:2. From the L ventricle, blood flows into the:3. The pulmonary veins carry blood to the:4. The most abundant blood supply goes to the:5. What type of blood vessel has valves? What

type of valves are they?

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)

Cardiac Tamponade

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

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

Mitral Valve Prolapse

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

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

Atherosclerosis

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

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

Congestive Heart Failure

Myocardium Disorders

• Coronary Artery Disease (CAD)– Leading cause of death in US– General term to describe decreased

blood flow to myocardium & associated side effects

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

Angioplasty

Warm Up 4/25/11Announcements:1. Practical grades online2. Practical & Quiz make ups today after school3. Use next blank box on warm up sheetWarm Up:1. What two vessels return blood to the heart after

systemic circulation?2. A ___________ is a small artery.3. What procedure can open a blocked artery and

restore blood to the heart? If this doesn’t work, what is a more invasive procedure?

4. What does MONA stand for? When is this treatment used?

5. A cardiac tamponade is the result of too much fluid in the:

Changes to Schedule

• Project due Friday May 13th

– Computer lab days: • 4/28 (2nd Period)• 4/29 (5th, 6th)• Block day (5/4, 5/5)

• Chapter 19 Quiz 5/11 or 5/12 (block day)

• Chapter 18/19 Test – Tuesday 5/17

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

Varicose Veins

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

DVT

Pulmonary Embolism

Venous Stasis Ulcers

• Result of chronic vein insufficiency

• Lack of oxygen to peripheral tissues

• Elevate leg & apply pressure

• Irregular edges• “Aching” pain

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)

Patent Ductus Arteriosus (PDA)

Atrial Septal Defect (ASD)

Ventricular Septal Defect (VSD)

Atrioventricular Septal Defect (AVSD)

Tetralogy of Fallot (TOF)

Transposition of the Great Vessels (TGV)

Coarcatation of the Aorta (CoA)

Ebstein’s Anomaly

Pulmonary Atresia

Truncus Arteriosus

Hypoplastic Left Heart Syndrome