THE CARDIOVASCULAR SYSTEM. Part 1
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1 THE CARDIOVASCULAR SYSTEM Part 1
2 CARDIOVASCULAR SYSTEM Blood Heart Blood vessels What is the function of this system? What other systems does it affect?
3 CARDIOVASCULAR SYSTEM Functions Transport gases, wastes, food, hormones, blood cells Systems affected Respiratory Urinary Digestive Musculoskeletal Immune system
4 THE HEART Four separate chambers in humans Double pump two closed circuits 5 L/minute
5 Two Complete and Separate Circuits Lungs tpulmonary Circuit Blood flows through lungs for gas exchange Pump Blood vessels, organs and tissues Systemic Circuit Blood flows to organs to deliver oxygenated blood and carries deoxygentaed blood back to heart.
6 Pulmonary arteries Venae cavae Right atrium Right ventricle Pulmonary Circuit Heart Systemic Circuit Capillary beds of lungs where gas exchange occurs Pulmonary veins Aorta and branches Left atrium Left ventricle Oxygen-rich, CO 2 -poor blood Oxygen-poor, CO 2 -rich blood Capillary beds of all body tissues where gas exchange occurs Figure 18.5
7 Located within mediastinum Midsternal line 2nd rib Diaphragm (a) Sternum Point of maximal intensity (PMI) Figure 18.1a
8 Superior vena cava Pulmonary trunk Diaphragm Aorta Parietal pleura (cut) Left lung Pericardium (cut) Apex of heart (c) Figure 18.1c
9 PERICARDIUM Membrane surrounding and protecting the heart Confines while still allowing free movement
10 PERICARDIUM Double walled organ Fibrous pericardium Fibrous connective tissue Prevents overstretching, protection, anchorage Serous pericardium Serous epithelium Double layer Parietal layer fused to fibrous pericardium Visceral layer also called epicardium
11
12 PERICARDIUM Pericardial cavity Between visceral and parietal serous pericardium Scant amount of serous fluid Pericarditis
13 Pericardium Myocardium Pulmonary trunk Fibrous pericardium Parietal layer of serous pericardium Pericardial cavity Epicardium (visceral layer of serous pericardium) Myocardium Endocardium Heart chamber Heart wall Figure 18.2
14 MUSCULAR WALL OF THE HEART Three layers Epicardium Also called the Myocardium Endocardium
15 Pericardium Myocardium Pulmonary trunk Fibrous pericardium Parietal layer of serous pericardium Pericardial cavity Epicardium (visceral layer of serous pericardium) Myocardium Endocardium Heart chamber Heart wall Figure 18.2
16
17 MUSCULAR WALL OF THE HEART Epicardium
18 MUSCULAR WALL OF THE HEART Myocardium Muscle and connective tissue Bulk of heart
19 Myocardium Cardiac muscle bundles Copyright 2010 Pearson Education, Inc. Figure 18.3
20 MUSCULAR WALL OF THE HEART Endocardium Endocarditis
21 Chambers ANATOMY OF THE HEART
22 ANATOMY OF THE HEART Chambers Right and left atria Separated by interatrial septum Coronary sulcus (atrioventricular groove) encircles the junction of the atria and ventricles Auricles increase atrial volume
23 ANATOMY OF THE HEART Chambers Right and left ventricles Separated by interventricular septum
24 Left ventricle Right ventricle Interventricular septum Figure 18.6
25 Schematic of Heart Anatomy In pipes = veins Out pipes = arteries Heart has 4 chambers 2 atria & 2 ventricles In Veins In Atria Heart chambers Out Arteries Out Ventricles
26 Major Vessels of the Heart Brachiocephalic trunk Superior vena cava Right pulmonary artery Ascending aorta Pulmonary trunk Right pulmonary veins Right atrium Right coronary artery (in coronary sulcus) Anterior cardiac vein Right ventricle Right marginal artery Small cardiac vein Inferior vena cava (b) Anterior view Left common carotid artery Left subclavian artery Aortic arch Ligamentum arteriosum Left pulmonary artery Left pulmonary veins Auricle of left atrium Circumflex artery Left coronary artery (in coronary sulcus) Left ventricle Great cardiac vein Anterior interventricular artery (in anterior interventricular sulcus) Apex Copyright 2010 Pearson Education, Inc. Figure 18.4b
27 ATRIA THE RECEIVING CHAMBERS Vessels entering right atrium Superior vena cava Inferior vena cava Coronary arteries and veins Vessels entering left atrium Right and left pulmonary veins
28 Aorta Superior vena cava Right pulmonary artery Pulmonary trunk Right atrium Right pulmonary veins Fossa ovalis Pectinate muscles Tricuspid valve Right ventricle Chordae tendineae Trabeculae carneae Inferior vena cava Left pulmonary artery Left atrium Left pulmonary veins Mitral (bicuspid) valve Aortic valve Pulmonary valve Left ventricle Papillary muscle Interventricular septum Epicardium Myocardium Endocardium (e) Frontal section Copyright 2010 Pearson Education, Inc. Figure 18.4e
29 Vessel leaving the right ventricle Pulmonary trunk Vessel leaving the left ventricle Aorta VENTRICLES THE DISCHARGING CHAMBERS
30 Aorta Superior vena cava Right pulmonary artery Pulmonary trunk Right atrium Right pulmonary veins Fossa ovalis Pectinate muscles Tricuspid valve Right ventricle Chordae tendineae Trabeculae carneae Inferior vena cava Left pulmonary artery Left atrium Left pulmonary veins Mitral (bicuspid) valve Aortic valve Pulmonary valve Left ventricle Papillary muscle Interventricular septum Epicardium Myocardium Endocardium (e) Frontal section Copyright 2010 Pearson Education, Inc. Figure 18.4e
31 HEART VALVES Atrioventricular (AV) valves Prevent backflow into the atria when ventricles contract Chordae tendineae anchor AV valve cusps to papillary muscles Semilunar valves Prevent backflow into the ventricles when ventricles relax Unidirectional blood flow through the heart
32 Pulmonary valve Aortic valve Area of cutaway Mitral valve Tricuspid valve Chordae tendineae attached to tricuspid valve flap (c) Papillary muscle Figure 18.8c
33 HEART VALVES Atrioventricular Separate atria from ventricles Tricuspid Right side Bicuspid (mitral) Left side Semilunar Separate ventricles from great arteries Pulmonary semilunar Aortic semilunar
34 Aorta Superior vena cava Right pulmonary artery Pulmonary trunk Right atrium Right pulmonary veins Fossa ovalis Pectinate muscles Tricuspid valve Right ventricle Chordae tendineae Trabeculae carneae Inferior vena cava Left pulmonary artery Left atrium Left pulmonary veins Mitral (bicuspid) valve Aortic valve Pulmonary valve Left ventricle Papillary muscle Interventricular septum Epicardium Myocardium Endocardium (e) Frontal section Copyright 2010 Pearson Education, Inc. Figure 18.4e
35 Myocardium Pulmonary valve Aortic valve Tricuspid Area of cutaway (right atrioventricular) Mitral valve valve Tricuspid valve Mitral (left atrioventricular) valve Aortic valve Pulmonary valve Fibrous skeleton (a) Pulmonary valve Aortic valve Area of cutaway Mitral valve Tricuspid Anterior valve (b) Myocardium Tricuspid (right atrioventricular) valve Mitral (left atrioventricular) valve Aortic valve Pulmonary valve Figure 18.8a
36 CARDIAC CIRCULATION The heart is two side-by-side pumps Right side = pulmonary circuit Vessels that carry blood to and from the lungs Left side = systemic circuit Vessels that carry the blood to and from all body tissues
37 PATHWAY OF BLOOD THROUGH THE HEART right atrium (via vena cava) tricuspid valve right ventricle pulmonary semilunar valve pulmonary trunk pulmonary arteries lungs pulmonary veins left atrium bicuspid valve left ventricle aortic semilunar valve aorta systemic circulation
38 1 Blood returning to the heart fills atria, putting pressure against atrioventricular valves; atrioventricular valves are forced open. 2 As ventricles fill, atrioventricular valve flaps hang limply into ventricles. 3 Atria contract, forcing additional blood into ventricles. Ventricle (a) AV valves open; atrial pressure greater than ventricular pressure Direction of blood flow Atrium Cusp of atrioventricular valve (open) Chordae tendineae Papillary muscle Atrium 1 Ventricles contract, forcing blood against atrioventricular valve cusps. 2 Atrioventricular valves close. 3 Papillary muscles contract and chordae tendineae tighten, preventing valve flaps from everting into atria. Cusps of atrioventricular valve (closed) Blood in ventricle (b) AV valves closed; atrial pressure less than ventricular pressure Figure 18.9
39 Aorta Pulmonary trunk As ventricles contract and intraventricular pressure rises, blood is pushed up against semilunar valves, forcing them open. (a) Semilunar valves open As ventricles relax and intraventricular pressure falls, blood flows back from arteries, filling the cusps of semilunar valves and forcing them to close. (b) Semilunar valves closed Figure 18.10
40
41 lub-dup HEART SOUNDS
42 Pulmonary arteries Venae cavae Right atrium Right ventricle Pulmonary Circuit Heart Systemic Circuit Capillary beds of lungs where gas exchange occurs Pulmonary veins Aorta and branches Left atrium Left ventricle Oxygen-rich, CO 2 -poor blood Oxygen-poor, CO 2 -rich blood Capillary beds of all body tissues where gas exchange occurs Copyright 2010 Pearson Education, Inc. Figure 18.5
43 CORONARY (CARDIAC) CIRCULATION The functional blood supply to the heart muscle Arteries Right and left coronary arteries Branch off base of the aorta Extensive branching throughout epicardium anastomoses Collateral circulation Cardiac veins feed into coronary sinus
44 Superior vena cava Anastomosis (junction of vessels) Right atrium Right coronary artery Right ventricle Right marginal artery (a) The major coronary arteries Aorta Pulmonary trunk Left atrium Left coronary artery Circumflex artery Left ventricle Anterior interventricular Posterior artery interventricular artery Figure 18.7a
45 Aorta Left pulmonary artery Left pulmonary veins Auricle of left atrium Left atrium Great cardiac vein Posterior vein of left ventricle Left ventricle Apex (d) Posterior surface view Superior vena cava Right pulmonary artery Right pulmonary veins Right atrium Inferior vena cava Coronary sinus Right coronary artery (in coronary sulcus) Posterior interventricular artery (in posterior interventricular sulcus) Middle cardiac vein Right ventricle Figure 18.4d
46 Coronary sinus drains into right atrium Superior vena cava Anterior cardiac veins Great cardiac vein Coronary sinus Small cardiac vein Middle cardiac vein (b) The major cardiac veins Figure 18.7b
47 COLLATERAL CIRCULATION Benefits of anastomoses Heart attacks in young versus older patients
48 QUESTIONS?
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