13. Which of the following structures acts as a pacemaker in the heart and is responsible for the establishment of the rhythm of heartbeat? (A) Bachmann bundle (B) AV node (C) SA node (D) bundle of His (E) Purkinje fiber

10. Coagulation is a delicate mechanism controlling clot formation and preventing blood drainage. What kind of dietary deficiency and clotting factor deficiency would lead to defective blood clotting and hemophilia A? (A) vitamin E; factor VIII (B) vitamin B12; factor VIII (C) vitamin E; von Willebrand factor (D) vitamin B12; von Willebrand factor (E) vitamin K; factor VIII

13. Which of the following structures acts as a pacemaker in the heart and is responsible for the establishment of the rhythm of heartbeat?
(A) Bachmann bundle
(B) AV node
(C) SA node
(D) bundle of His
(E) Purkinje fiber

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