A normal resting heart rate for adults ranges from ——- beats per minute.

The system that controls cardiac muscles is the ———

Which area of the brainstem controls heart rate?

An important part of the electrical conduction system of the heart is ———

Which of the following is the primary pacemaker of the heart?

The SA node is located in the _____

The bundle of His is made up of _________

Which part of the medulla oblongata controls the heart rate?

How many chambers of the heart are there?

Which receptors increase heart rate and contractility?

The medulla oblongata controls ——-

How many nerves are connected with the medulla oblongata which regulates heart rate by either speeding it up or slowing it down?

Which receptors can regulate heart rate?

From where in the electrical system of the heart does the Bundle of His transmit impulses from?

Bundle of His is also known as the ———

The SA node is ——- in size as compared to the AV node

Which of the following is primarily regulated by cardiac impulses?

Which of the following is primarily regulated directly by the cardiac center in the brainstem?

Which of these shows maximum rhythmicity?

The firing rate of the atrioventricular node is ————-

The firing rate of the SA node is ————-

The electrical relay station between the upper and lower chambers of the heart is called —————–

Which of these is the major element in the cardiac conduction system, the system that controls the heart rate?