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Purkinje fibres are present in:...

Purkinje fibres are present in:

A

Left auricle

B

Right auricle

C

Ventricular myocardium

D

3A node

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Purkinje fibres are nerve fibres supplying the ventricular muscles.

Indicate whether the following statements are true or false : (i) Fish heart contains only oxygenated blood. (ii) Closure of A-V valves produces the second heart sound. (iii) The vagus nerve retards the heart rate. (iv) The S-A node is the pacemaker of the heart. (v) Columnae carneae occur in the auricles. (vi) Purkinje fibres are nerve fibres present in the heart wall.

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(a) Observe slide of smooth muscle fibre under the microscope and draw its labelled diagram. (b) Give name of atleast two structures where smooth muscle fibres are present in humans.