Which of the following is true regarding contractions of the heart?
A) The ventricles contract first, followed by the atria.
B) The contractions do not occur in any specific or precise sequence each time.
C) Cardiac muscle tissue contracts under neural stimulation.
D) The rate of cardiac contractions are established by the conducting fibers.
E) Cardiac contractions are coordinated by specialized conducting cells that distribute the stimulus to cardiac muscle cells.

Question

Quizplus · Accepted Answer

Cardiac contractions are coordinated by specialized conducting cells, known as the cardiac conduction system, which distribute the stimulus to cardiac muscle cells. This ensures that the contractions occur in a precise, coordinated sequence, allowing for efficient pumping of blood. The rate of contractions is also established by the conducting fibers within this system. The atria do contract first, but only by a fraction of a second before the ventricles.

Which of the Following Is True Regarding Contractions of the Heart