32. Which of the following is the pacemaker of the cardiac conduction system? (A) Sinoatrial node. (B) Medulla oblongata. (C) Purkinje fibers. (D) Atrioventricular node.

32. Which of the following is the pacemaker of the cardiac conduction system?
(A) Sinoatrial node.
(B) Medulla oblongata.
(C) Purkinje fibers.
(D) Atrioventricular node.

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統計： A(1), B(0), C(0), D(0), E(0) #3308511

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39. What is the difference between pollination and fertilization in flowering plants? (A) If fertilization occurs, pollination is unnecessary. (B) Pollination is the transfer of pollens to a stigma. Fertilization is the fusion of haploid nuclei. (C) Pollen is formed within megasporangia so that male and female gametes are near each other. (D) Pollination easily occurs between plants of different species, fertilization is within a species. (E) Fertilization precedes pollination.

32. Which of the following is the pacemaker of the cardiac conduction system?
(A) Sinoatrial node.
(B) Medulla oblongata.
(C) Purkinje fibers.
(D) Atrioventricular node.

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