Cardiac Muscle Properties PDF

Properties of the cardiac muscle 1 Prof. Tarig Hakim Merghani RAKCOMS- RAKMHSU  Objectives Compare cardiac and skeletal muscles Compare the action potential in a cardiac muscle, a skeletal muscle and a nerve Explain why cardiac muscle can’t remain in a stat...

Properties of the cardiac muscle 1 Prof. Tarig Hakim Merghani RAKCOMS- RAKMHSU  Objectives Compare cardiac and skeletal muscles Compare the action potential in a cardiac muscle, a skeletal muscle and a nerve Explain why cardiac muscle can’t remain in a state of sustained (tetanic) contraction Describe the physiological characteristics of the cardiac muscle General design of the CVS The CVS consists of: –The heart –The blood vessels  The Heart Consists of : –4 chambers  The Heart Consists of : –4 valves trifid 2 atrio-ventricular valves Avine 2 semilunar valves pulmans SA  The Heart mom oxygenated 2 pumps:regect an Laf –Rt pump blood to pulmonary circulation –Lt pump to systemic circulation oxygenatedood The pulmonary circulation The systemic circulation  The Heart Types of muscles: –Cardiac muscle proper (atrial & ventricular muscles ) –Conductive system or mint Physiologic Anatomy of the Cardiac Muscle The cardiac muscle cells Connected by the intercalated discs that contain gap junctions (to allow movement of ions between cells) grab  the 9 Physiologic Anatomy of Cardiac Muscle The cardiac muscle acts as a syncytium (= functional syncytium) we syncytium as is to this IEEE d  Physiologic Anatomy of Cardiac Muscle There are two functional syncytia in the heart: atrial and ventricular m (separated by a fibrous ring that transmit surrounds the AV valves) action potential to Conductivity  The properties of the cardiac muscle The properties of the cardiac muscle 1- Excitability mm 2- Automaticity mm 3- Conductivity 4- Contractility mm 5- Rhythmicity 1- Excitability The ability of the cardiac muscle to respond to adequate stimuli by generating action potentials muscle IintIEEEiereal T.ir skeletal cardiac Action potential in the cardiac muscle TEE A ÑdÑ Fainting heart end plate Ñ potential me westmthroglofeti.at channel ligated membrane resting mai potential cause a Action potential in the 7 cardiac muscle made The differenteetal from The plateau prolongs the cardiac c muscle action potential  efflux of Ke Influx replant result of cast will careerist IEEE doin up or Depolarization tion efflux Ke reassure imine k FEE polarized wal