the mammalian heart

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  • The Mammalian HeartExternal and Internal StructureMass = 300 gMuscle = Cardiac muscleALBIO9700/2006JK

  • Cardiac muscleALBIO9700/2006JK

  • A mammalian heart seen from the front (External)ALBIO9700/2006JK

  • Coronary arteriesALBIO9700/2006JK

  • Vertical section through a mammalian heart (Internal) ALBIO9700/2006JK

  • Vertical section through a mammalian heart (Internal) septum papillary muscleALBIO9700/2006JK(mitral)

  • Atrio-ventricular valvesALBIO9700/2006JK

  • Difference in thickness of the walls of different chambers and their functions?


  • Mammalian circulatory systemClosed double circulationALBIO9700/2006JK

  • Cardiac cycleALBIO9700/2006JK* Sequence of events which makes up one heart beat

  • Heart action controlMyogenic naturally contracts and relaxes, not needing to receive impulses from a nerve to make it contractImportant components:i) sinoatrial node (SAN/pacemaker) sets the rhythm of contraction for all other cardiac muscle cellsii) atrio-ventricular node (AVN) picks up the excitation wave as it spreads across the atria and passes it on to Purkyne tissueiii) Purkyne tissue conducting fibres that transmits excitation wave through ventrical wallsFibrillation heart wall flutters rather than contracting as a whole and then relaxing as a whole (started by electric shock or by damage to large areas of muscle in the walls of the heart)ALBIO9700/2006JK

  • FibrillationALBIO9700/2006JK

  • Heart action controlALBIO9700/2006JKPurkyne tissue

  • Electrocardiogram (ECG)Electrodes placed over opposite sides of the heart and the electrical potentials generated recorded with time

    ECG graph of voltage against timeALBIO9700/2006JK

  • ALBIO9700/2006JK

  • ALBIO9700/2006JK


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