Which of the following structures helps to electrically insulate the ventricular cells from the atrial cells?

Choose which statement is correct about the heart.

I. The heart contracts without any external stimulation due to autorhythmiticity.

II. The pacemaker cells of the heart do not contribute to the contractile force of the heart

Identify the correct order of the parts of the conduction system of heart.

Which of the following is not an intrinsic control of arteriolar smooth muscle in the systemic circulation?

What cardiac center controls the parasympathetic neurons that slow down the heart rate?

Which of the following actions increases muscle contractility?