In the heart A. The left atrial wall is about three times thicker tha

1.	In the heart A. The left atrial wall is about three times thicker than the right atrial wall. B. Systolic contraction normally begins in the left atrium. C. Excitation spreads directly from atrial muscle cells to ventricular muscle cells. D. Atrial and ventricular muscle contracts simultaneously in systole. E. The contracting ventricles shorten from apex to base.
Answer» A. False Their wall thickness is similar since the workload of the two atria is similar. B. False It begins at the sinuatrial node in the right atrium. C. False Excitation can only pass from atria to ventricles via specialized conducting tissue in the AV bundle. D. False Delay of excitation in the AV bundle makes atrial precede ventricular contraction. E. True Due to the spiral arrangement of some muscle fibres; circular fibres reduce ventricular circumference.

In the heart A. The left atrial wall is about three times thicker than the right atrial wall. B. Systolic contraction normally begins in the left atrium. C. Excitation spreads directly from atrial muscle cells to ventricular muscle cells. D. Atrial and ventricular muscle contracts simultaneously in systole. E. The contracting ventricles shorten from apex to base.

Answer»

A. False Their wall thickness is similar since the workload of the two atria is similar.

B. False It begins at the sinuatrial node in the right atrium.

C. False Excitation can only pass from atria to ventricles via specialized conducting tissue in the AV bundle.

D. False Delay of excitation in the AV bundle makes atrial precede ventricular contraction.

E. True Due to the spiral arrangement of some muscle fibres; circular fibres reduce ventricular circumference.

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