Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Electrocardiography wikipedia , lookup
Management of acute coronary syndrome wikipedia , lookup
Coronary artery disease wikipedia , lookup
Cardiac surgery wikipedia , lookup
Lutembacher's syndrome wikipedia , lookup
Myocardial infarction wikipedia , lookup
Quantium Medical Cardiac Output wikipedia , lookup
Antihypertensive drug wikipedia , lookup
Dextro-Transposition of the great arteries wikipedia , lookup
Cardio Vascular System Audience: Health/Physical educators and health aspiring students By Vince Colucci 1 Size of Heart Average Size of Heart • 14 cm long • 9 cm wide 2 Location of Heart • posterior to sternum • medial to lungs • base lies beneath 2nd rib • lies upon diaphragm 3 Coverings of Heart 4 Wall of the Heart 5 Heart Chambers Right Atrium • receives blood from Right Ventricle • receives blood from right atrium Left Atrium • receives blood from pulmonary veins Left Ventricle • receives blood from left atrium 6 Skeleton of Heart • fibrous rings to which the heart valves are attached 7 Path of Blood Through the Heart 8 Path of Blood Through the Heart 9 Electrocardiogram • recording of electrical changes that occur in the myocardium • used to assess heart’s ability to conduct impulses P wave – atrial depolarization QRS wave – ventricular depolarization T wave – ventricular repolarization 10 Electrocardiogram A prolonged QRS complex may result from damage to the A-V bundle fibers 11 Regulation of Cardiac Cycle Additional Factors that Influence HR • physical exercise • body temperature • concentration of various ions • potassium • calcium • parasympathetic impulses decrease heart action • sympathetic impulses increase heart action • cardiac center regulates autonomic impulses to the heart 12 Blood Vessels • arteries • carry blood away from ventricles of heart • arterioles • receive blood from arteries • carry blood to capillaries • capillaries • sites of exchange of substances between blood and body cells • venules • receive blood from capillaries • veins • carry blood toward ventricle of heart 13 Arteries and Arterioles Artery • thick strong wall • endothelial lining • middle layer of smooth muscle and elastic tissue • outer layer of connective tissue • carries blood under relatively high pressure Arterioles • thinner wall than artery • endothelial lining • some smooth muscle tissue • small amount of connective tissue • helps control blood flow into a capillary 14 Metarteriole connects arteriole directly to venule 15 Capillaries • smallest diameter blood vessels • extensions of inner lining of arterioles • walls are endothelium only • semipermeable • sinusoids – leaky capillaries 16 Capillary Network 17 Venules and Veins Venule • thinner wall than arteriole • less smooth muscle and elastic tissue than arteriole Vein • thinner wall than artery • three layers to wall but middle layer is poorly developed • some have flaplike valves • carries blood under relatively low pressure • serves as blood reservoir 18 Arterial Blood Pressure Blood Pressure – force the blood exerts against the inner walls of the blood vessels Arterial Blood Pressure • rises when ventricles contract • falls when ventricles relax • systolic pressure – maximum pressure • diastolic pressure – minimum pressure 19 Pulse • alternate expanding and recoiling of the arterial wall that can be felt 20 Informational Link http://www.ambulancetechnician study.co.uk/circsystem.html 21