If the heart of a mammal is injected with a $2\%$ $CaCl_2$ solution,then:

  • A
    Heart beat will increase
  • B
    Heart beat will decrease
  • C
    Heart beat will stop
  • D
    No effect

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The human heart is enclosed in a double-walled sac called:

Which one of the statements is correct with reference to the circulation of blood in a mammal?

Coronary sinus carries . . . . . . to the right atrium.

Which structure initiates the heartbeat?

When the right ventricle contracts,the blood goes into:

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