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; Ph. i 5 (eardiacyte). f hnical activity, * Theentire heart is made of cardiac muscles (cardiacyt ) vies, which giveS rise to meca, , tissue shows electrical proper!, ays which are, , | * Cardiac muscle being anexcitable, | in the form of contraction. ,, * Cardiac conduction system composed of nodular tissu, , modified cardiocytes., , , , , , , , , , , , , , , Internodal fibril, , 2SA-Node /. Pacemaker #, (No. = 3), , Position - Upper right, R.A [SA Node] L.A’ wall of RA, below SV cava., by, iAV-Node; AV-Node / Pace setter, Left branch, , | _J¥f- Right pranch, Furkinje fibres, , RIA Position - Lower, right side, Bundteof hi§ of-inter auricular septum., , Purkinje fibre, , Ventricular muscgles, , , , , According to NCERT ao, Left branch + Right branch + Purkinje fibre = Bundle o, , , , Cardiac Conducting system, <Includes, , Bundle of His /AV-Bundle }} Purkinje fibres, It is the prolongation of AV-}} It is the network, , node. It divides into two}} in the entire venbranches which go down in }} tricular wall., , the wall of respective ventricle upto apex., , , , AVN / Pace setter / Node of, Aschoft and Tawara, It lies at the base of right auricle, near the inter auricular septum. It, slows down the:impulse fron au|ricle.to ventricle. This delay allows, It is the renmant of si-| | auricle to empty their blood before, nus venosus, tt be of | | ventricular contracticn occurs., , CE, , , , SAN / Pacemaker, It is located on the right, atrial wall. It generates, impulse 75/m . Thus it, is the broad casting 9, impulse for heart beat., , , , , , , , , , , , , , Note :- 5, « a ce t, , * DamagéSAN does generate cardiac impulse -> Irregular heart beat > Biselents Arrhythima-> The, , treatment is placement of pacemaker in chest by surgery. i, , A 1, * Ectopic pacemaker — It is the pace maker other than SAN. AV Nod inj, ‘ i . le, Purkinjee fibre et, produce imputse (if SAN fails), they are called Ectopic pace maker. ee, , DOUBLE CIRCULATION, , Itis the process where blood passes twice through the heart durin emia, i OER g one complete i . ;, birds and mammals. It is an efficient process that supplies oxygen to all oe sheer Senn, ' i, , Arterial System, , , , , Pulmonary Vein —