[A]: in mammalian heart there is a very swift conduction of stimulation all over the body.
[R]: Conduction of stimulation is caused by Purkinje fibres and Bundle of His

[A]: in mammalian heart there is a very swift conduction of stimulation all over the walls of the heart [R]: Conduction of stimulation is caused by Purkinje fibres and Bundle of His

Which sequence of events best represents the conduction of an impulse through the heart? (i) Sinoatrial node (ii) Atrioventricular node (iii) Purkinje fibres (iv) Bundle of His

Draw diagram of conducting system of human heart. Label SA node and bundle of His.

A : The cardiac impulse which originates from SA node in mammalian heart cannot spread directly from atria to ventricles R : In mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.

A : The cardiac impulse which originates from SA node in mammalian heart cannot spread directly from atria to ventricles R : In mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/t the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The temperature of this new wire is again raised from 10^@C to 110^@C The percentage increase of his resistance would be

Which is the correct route through which pulse making, impulse travels in the heart? (A) SA node - - - - AV node - - - Bundle of His - - - - Purkinje fibres (B) AV node - - - Bundle of His - - - - SA node - - - Purkinje fibres - - - heart muscles (C) AV node - - - SA node - - - Purkinje fibres - - - Bundle of His - - - heart muscles (D) SA node - - - Purkinje fibres - - - Bundle of His - - - AV node - - - heart muscles.

Given these structures of the conduction system of the heart 1. Bundles of His 2. AV node 3. Bundle branches 4. Purkinje fibres 5. SA node Choose the arrangement that lists the structures in an order of an action potential passes through them.